0001624794-26-000027 | 10-K | XBRL Viewer

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RETIREMENT PLANS - Employee Stock Ownership Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Award requisite service period	1 year
Period of credited service after which participant's interest in contributions to ESOP fully vest	3 years
Contributions to the ESOP	$ 4.9	$ 4.2	$ 4.8
ESOP expense recorded	$ 5.0
CSWI
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares held in ESOP (in shares)	352,741	432,912

DETAILS OF CERTAIN CONSOLIDATED BALANCE SHEET CAPTIONS - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Land and improvements	$ 3,112	$ 3,112
Buildings and improvements	57,782	56,982
Plant, office and laboratory equipment	165,378	136,244
Construction in progress	6,451	10,296
Other	365	0
Property, plant and equipment, gross	233,088	206,634
Less: Accumulated depreciation	(125,552)	(113,219)
Property, plant and equipment, net	107,536	93,415
Property, Plant and Equipment [Line Items]
Depreciation	15,907	14,210	$ 13,961
Cost of revenue, depreciation	11,700	9,300	9,100
Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Depreciation	$ 15,900	$ 14,200	$ 13,900

REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenues, net	$ 1,082,549	$ 878,301	$ 792,840
Contractor Solutions
Disaggregation of Revenue [Line Items]
Revenues, net	802,703	609,706	528,641
Engineered Building Solutions
Disaggregation of Revenue [Line Items]
Revenues, net	159,954	147,476	149,458
Specialized Reliability Solutions
Disaggregation of Revenue [Line Items]
Revenues, net	119,892	121,119	114,741
Build-to-order
Disaggregation of Revenue [Line Items]
Revenues, net	105,611	106,562	99,760
Build-to-order \| Contractor Solutions
Disaggregation of Revenue [Line Items]
Revenues, net	0	0	0
Build-to-order \| Engineered Building Solutions
Disaggregation of Revenue [Line Items]
Revenues, net	0	0	0
Build-to-order \| Specialized Reliability Solutions
Disaggregation of Revenue [Line Items]
Revenues, net	105,611	106,562	99,760
Book-and-ship
Disaggregation of Revenue [Line Items]
Revenues, net	976,938	771,739	693,080
Book-and-ship \| Contractor Solutions
Disaggregation of Revenue [Line Items]
Revenues, net	802,703	609,706	528,641
Book-and-ship \| Engineered Building Solutions
Disaggregation of Revenue [Line Items]
Revenues, net	159,954	147,476	149,458
Book-and-ship \| Specialized Reliability Solutions
Disaggregation of Revenue [Line Items]
Revenues, net	$ 14,281	$ 14,557	$ 14,981

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

Mar. 31, 2026

Equity [Abstract]

Schedule of Stockholders Equity

Common Stock


	March 31, 2026		March 31, 2025
	Common Stock	Treasury Stock	Common Stock	Treasury Stock
Beginning of the year	17,809,590	1,026,941	16,465,776	952,394
Vesting of performance shares and restricted stock units	59,637	22,416	58,640	21,745
Reissuance of treasury shares	—	(15,539)	—	(17,186)
Restricted stock awards activities	23,832	6,897	20,174	10,786
Share repurchases	—	503,076	—	59,202
Equity issuance	—	—	1,265,000	—
End of the year	17,893,059	1,543,791	17,809,590	1,026,941

INCOME TAXES - Schedule of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Current
U.S. Federal	$ 24,892	$ 35,448	$ 28,832
State and local	9,022	9,371	8,057
Foreign	3,546	4,378	3,444
Provision for income taxes	37,460	49,197	40,333
Deferred
U.S. Federal	(320)	(4,888)	(2,560)
State and local	(2,004)	(1,374)	(10)
Foreign	(2,430)	(302)	178
Provision for income taxes	(4,754)	(6,564)	(2,392)
Total
U.S. Federal	24,572	30,560	26,272
State and local	7,018	7,997	8,047
Foreign	1,116	4,076	3,622
Provision for income taxes	$ 32,706	$ 42,633	$ 37,941

RETIREMENT PLANS - Summary Of The Changes In The Plan's Pension Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 1,186	$ 1,217
Interest cost	63	64	$ 65
Actuarial loss	4	11
Benefits paid	(106)	(106)
Benefit obligation at end of year	1,147	1,186	$ 1,217
Accumulated benefit obligation	$ 1,147	$ 1,186

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net income	$ 112,847	$ 137,484	$ 102,539
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	15,907	14,210	13,961
Amortization of acquisition-related intangible assets & inventory step-up	51,174	28,029	22,919
Amortization of deferred financing fees	1,071	766	769
Provision for inventory reserves	4,254	2,686	4,229
Provision for credit losses	2,279	1,408	814
Share-based and other executive compensation	14,930	13,587	11,537
Fair value change in contingent consideration	0	2,100	0
Net loss (gain) on disposals of property, plant and equipment	756	35	(2,677)
Net pension benefit	67	66	67
Impairment expenses	15,634	0	1,600
Net deferred taxes	(6,035)	(6,915)	(2,497)
Changes in operating assets and liabilities:
Accounts receivable	(27,076)	(9,116)	(17,897)
Inventories	(36,751)	(35,699)	10,364
Prepaid expenses and other current assets	(5,204)	(1,369)	4,608
Other assets	782	1,424	1,146
Accounts payable and other current liabilities	10,702	21,664	12,293
Retirement benefits payable and other liabilities	(5,684)	(1,998)	557
Net cash provided by operating activities	149,653	168,362	164,332
Cash flows from investing activities:
Capital expenditures	(17,257)	(16,266)	(16,575)
Proceeds from sale of assets held for investment	0	0	1,665
Proceeds from sale of assets	217	1,229	2,185
Cash paid for investments	(4,800)	(2,500)	0
Cash paid for acquisitions (net of cash received)	(1,021,233)	(84,684)	(29,779)
Net cash used in investing activities	(1,043,073)	(102,221)	(42,504)
Cash flows from financing activities:
Borrowings on lines of credit	505,724	32,723	112,319
Repayments of lines of credit	(226,724)	(198,723)	(199,319)
Borrowings on Term Loan A	600,000	0	0
Repayments on Term Loan A	(7,500)	0	0
Payments of deferred loan costs	(5,271)	0	0
Payments of contingent consideration	(11,988)	(1,085)	(2,950)
Purchase of treasury shares	(132,746)	(27,693)	(15,268)
Proceeds from issuance of equity	0	347,407	0
Distributions to redeemable noncontrolling interest shareholder	(2,000)	0	0
Dividends paid to shareholders	(18,021)	(14,582)	(11,805)
Net cash provided by (used in) provided by financing activities	701,474	138,047	(117,023)
Effect of exchange rate changes on cash and equivalents	(100)	(499)	(1,104)
Net change in cash and cash equivalents	(192,046)	203,689	3,701
Cash and cash equivalents, beginning of period	225,845	22,156	18,455
Cash and cash equivalents, end of period	33,799	225,845	22,156
Supplemental non-cash disclosure:
Cash paid during the year for interest	20,915	4,789	12,254
Cash paid during the year for income taxes	46,416	50,866	39,295
Non-cash investing and financing activities:
Contingent consideration arising from acquisitions	4,000	15,000	6,800
Capital expenditures included in accounts payable and other current liabilities	$ 520	$ 641	$ 427

CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Treasury Shares	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at beginning of period at Mar. 31, 2023	$ 525,675	$ (82,734)	$ 163	$ 123,336	$ 493,319	$ (8,409)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	11,537			11,537
Stock activity under stock plans	(4,965)	(4,966)	1
Reissuance of treasury shares	4,819	2,526		2,293
Repurchase of common shares	(10,469)	(10,469)
Net income	101,648				101,648
Dividends	(11,805)			87	(11,892)
Other comprehensive income, net of tax	(717)					(717)
Balance at end of period at Mar. 31, 2024	615,723	(95,643)	164	137,253	583,075	(9,126)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	13,587			13,587
Stock activity under stock plans	(9,425)	(9,425)
Reissuance of treasury shares	4,158	1,211		2,947
Repurchase of common shares	(18,268)	(18,268)
Net income	136,652				136,652
Dividends	(14,587)			105	(14,692)
Equity issuance	347,407		13	347,394
Other comprehensive income, net of tax	(3,001)					(3,001)
Balance at end of period at Mar. 31, 2025	1,072,246	(122,125)	177	501,286	705,035	(12,127)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	14,930			14,930
Stock activity under stock plans	(8,112)	(8,113)	1
Reissuance of treasury shares	4,857	1,105		3,752
Repurchase of common shares	(128,571)	(128,571)
Net income	112,045				112,045
Dividends	(18,016)			108	(18,124)
Other comprehensive income, net of tax	1,030					1,030
Balance at end of period at Mar. 31, 2026	$ 1,050,409	$ (257,704)	$ 178	$ 520,076	$ 798,956	$ (11,097)

LEASES - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 17,133	$ 13,132
Right-of-use assets obtained in exchange for new operating lease obligations	$ 16,371	$ 30,018

RELATED PARTY TRANSACTIONS (Details) - USD ($)	12 Months Ended
RELATED PARTY TRANSACTIONS (Details) - USD ($)	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Related Party Transactions [Abstract]
Related party transaction	$ 0	$ 0	$ 0

GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount	$ 948,163	$ 427,826
Accumulated Amortization	(181,583)	(141,520)
Trade names and trademarks not being amortized
Indefinite-lived Intangible Assets [Line Items]
Gross Amount	$ 133,471	71,604
Patents
Finite-Lived Intangible Assets [Line Items]
Wtd Avg Life (Years)	10 years
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount	$ 17,785	17,784
Accumulated Amortization	$ (11,312)	(10,189)
Customer lists and amortized trademarks
Finite-Lived Intangible Assets [Line Items]
Wtd Avg Life (Years)	15 years
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount	$ 922,925	402,765
Accumulated Amortization	$ (165,943)	(127,551)
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Wtd Avg Life (Years)	6 years
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount	$ 1,000	1,000
Accumulated Amortization	$ (814)	(639)
Other
Finite-Lived Intangible Assets [Line Items]
Wtd Avg Life (Years)	10 years
Finite-Lived Intangible Assets, Net [Abstract]
Gross Amount	$ 6,453	6,277
Accumulated Amortization	$ (3,514)	$ (3,141)

BUSINESS HELD FOR SALE AND EXIT ACTIVITIES - Schedule of Business Held for Sale In Our Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets held for sale	$ 8,742	$ 0
Discontinued Operations, Held-for-Sale \| Greco US Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, net	3,733
Inventories, net	2,251
Prepaid expenses and other current assets	373
Right-of-use lease assets	2,385
Total assets held for sale	8,742
Accounts payable	566
Accrued and other current liabilities	1,869
Operating lease liabilities	2,043
Total liabilities held for sale	$ 4,478

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING - Schedule of Fair Value of Derivatives (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Derivatives, Fair Value [Line Items]
Current derivative asset	$ 761	$ 0
Non-current derivative asset	447	0
Hedging Instrument \| Interest rate swap
Derivatives, Fair Value [Line Items]
Current derivative asset	761	0
Non-current derivative asset	$ 447	$ 0

DETAILS OF CERTAIN CONSOLIDATED BALANCE SHEET CAPTIONS - Schedule of Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating lease liabilities	$ 61,862	$ 58,120
Deferred income taxes	98,226	52,688
Tax Reserve	9,295	14,728
Long-term contingent consideration liability	5,175	12,235
Other	4,931	576
Other long-term liabilities	$ 179,489	$ 138,347

INCOME TAXES - Schedule of Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Income Tax Disclosure [Abstract]
U.S. Federal	$ 145,556	$ 163,935	$ 127,647
Foreign	(3)	16,182	12,833
Income before income taxes	$ 145,553	$ 180,117	$ 140,480

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following table presents the fair values of the Company's assets and liabilities measured on a recurring basis:


	March 31, 2026				March 31, 2025
(in thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Significant Other Observable Inputs (Level II):
Interest rate swap	$	1,208	$	1,208	$	—	$	—

Unobservable Inputs (Level III):
Acquisition-related contingent consideration liabilities	16,655		16,655		24,385		24,385

Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

The following table presents the changes in the estimated fair values of the Company's contingent consideration liabilities measured using significant unobservable inputs (Level III):


(in thousands)	March 31, 2026		March 31, 2025
Balance at beginning of the year:	$	24,385	$	7,445
Cash payments	(11,730)		(160)
Change in fair value of contingent consideration liabilities	—		2,100
Additions	4,000		15,000
Ending balance	$	16,655	$	24,385

SHARE-BASED COMPENSATION

12 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

SHARE-BASED COMPENSATION

Prior to September 17, 2024, we maintained the shareholder-approved 2015 Equity and Incentive Compensation Plan (the “2015 Plan”), which provided for the issuance of up to 1,230,000 shares of CSW common stock through the grant of stock options, stock appreciation rights, restricted shares, restricted stock units, performance shares, performance units or other share-based awards, to employees, officers and non-employee directors. On August 15, 2024, our shareholders approved the 2024 Equity and Incentive Compensation Plan (the “2024 Plan”) and on September 17, 2024, we registered the offering of shares under the 2024 Plan on a Registration Statement on Form S-8 (the “2024 Plan Registration”). Following the 2024 Plan Registration, no further awards have been or will be granted under the 2015 Plan, and the 2015 Plan’s remaining share reserve for new awards was cancelled. Any awards previously granted under the 2015 Plan will remain outstanding and vest in accordance with their original terms and conditions.

The 2024 Plan provides for the issuance of up to 850,000 shares of CSW common stock through the grant of stock options, stock appreciation rights, restricted shares, restricted stock units, performance shares, performance units or other share-based awards, to eligible participants. As of March 31, 2026, 784,584 shares were reserved and available for issuance under the 2024 Plan.

We recorded share-based compensation expense, net of estimated forfeitures, for restricted stock as follows for the years ended March 31, 2026, 2025 and 2024 (in thousands):


	Year Ended March 31,
	2026		2025		2024
Share-based compensation expense	$	14,930	$	13,587	$	11,537
Related income tax benefit (a)	(3,733)		(3,397)		(2,885)
Net share-based compensation expense	$	11,197	$	10,190	$	8,652

(a) Income tax benefit is estimated using the statutory rate

Restricted stock activity was as follows:


	Year Ended March 31, 2026
	Number of Shares	Weighted Average Grant Date Fair Value
Outstanding at April 1, 2025	194,149	$	203.62
Granted	74,454	316.53
Vested	(90,813)	185.80
Canceled	(4,315)	254.43
Outstanding at March 31, 2026	173,475	$	236.56

During the restriction period, the holders of restricted shares are entitled to vote and receive dividends. Unvested restricted shares outstanding as of March 31, 2026 and 2025 included 73,159 and 85,998 shares (at target), respectively, with performance-based vesting provisions, having vesting ranges from 0-200% based on predefined performance targets with market conditions. Performance-based awards accrue dividend equivalents, which are settled upon (and to the extent of) vesting of the underlying award, and do not have the right to vote until vested. Performance-based awards are earned upon the achievement of objective performance targets and are payable in common shares. Compensation expense is calculated based on the fair market value as determined by a Monte Carlo simulation and is recognized over a 36-month cliff vesting period. We granted 16,982 and 18,962 awards with performance-based vesting provisions during the years ended March 31, 2026 and 2025, respectively, with a vesting range of 0-200%.

At March 31, 2026, we had unrecognized compensation cost related to unvested restricted shares of $18.0 million, which will be amortized into net income over the remaining weighted average vesting period of 1.9 years. The total fair value of restricted shares granted during the years ended March 31, 2026 and 2025 was $14.3 million and $14.4 million, respectively. The total fair value of restricted shares vested during the years ended March 31, 2026 and 2025 was $24.7 million and $27.8 million, respectively.

INCOME TAXES

12 Months Ended

Mar. 31, 2026

Income Tax Disclosure [Abstract]

INCOME TAXES

Income before income taxes was comprised of the following (in thousands):


	Year Ended March 31,
	2026		2025		2024
U.S. Federal	$	145,556	$	163,935	$	127,647
Foreign	(3)		16,182		12,833
Income before income taxes	$	145,553	$	180,117	$	140,480

The following table summarized by jurisdiction our income taxes paid, net of refunds (in thousands):


	Year Ended March 31,
	2026		2025		2024
Federal	$	31,400	$	38,263	$	30,916
State	10,544		9,677		6,448
Foreign	4,472		2,926		1,931
	$	46,416	$	50,866	$	39,295

No single state or foreign jurisdiction exceeded five percent of total income taxes paid for the fiscal years ended March 31, 2026, 2025 and 2024.

Income tax expense consists of the following (in thousands):


	Current		Deferred		Total
March 31, 2026
U.S. Federal	$	24,892	$	(320)	$	24,572
State and local	9,022		(2,004)		7,018
Foreign	3,546		(2,430)		1,116
Provision for income taxes	$	37,460	$	(4,754)	$	32,706
March 31, 2025
U.S. Federal	$	35,448	$	(4,888)	$	30,560
State and local	9,371		(1,374)		7,997
Foreign	4,378		(302)		4,076
Provision for income taxes	$	49,197	$	(6,564)	$	42,633
March 31, 2024
U.S. Federal	$	28,832	$	(2,560)	$	26,272
State and local	8,057		(10)		8,047
Foreign	3,444		178		3,622
Provision for income taxes	$	40,333	$	(2,392)	$	37,941

Income tax expense differed from the amounts computed by applying the U.S. federal statutory income tax rate of 21.0% to income before income taxes as a result of the following (in thousands):


	Year Ended March 31,
	2026				2025				2024
	Amount		Percent		Amount		Percent		Amount		Percent
Income before income tax	$	145,553			$	180,117			$	140,480
U.S. federal statutory tax rate	30,566		21.0	%	37,825		21.0	%	29,501		21.0	%
United States
State and local income taxes (1), (2), (3)	5,544		3.8	%	6,325		3.5	%	6,358		4.5	%
Effect of cross-border tax laws	(758)		(0.5)	%	(908)		(0.5)	%	(345)		(0.2)	%
Tax credits	(389)		(0.3)	%	(274)		(0.2)	%	(21)		—	%
Changes in valuation allowances	—		—	%	(216)		(0.1)	%	(132)		(0.1)	%
Nontaxable or nondeductible items
Executive compensation limitation	1,731		1.2	%	2,062		1.1	%	2,070		1.5	%
Indemnification asset	269		0.2	%	124		0.1	%	1,789		1.3	%
Other	289		0.2	%	(1,453)		(0.8)	%	(541)		(0.4)	%
Other adjustments	(750)		(0.5)	%	286		0.2	%	(1,856)		(1.3)	%
Foreign tax effects
Canada	1,722		1.2	%	607		0.3	%	1,119		0.8	%
Other foreign jurisdictions	(289)		(0.2)	%	543		0.3	%	(60)		—	%
Changes in unrecognized tax benefits ("UTP")	(5,229)		(3.6)	%	(2,288)		(1.3)	%	59		—	%
Income tax expense	$	32,706	22.5	%	$	42,633	23.7	%	$	37,941	27.0	%

(1) State taxes in South Carolina, California, Pennsylvania, and Virginia are attributable to greater than 50% of the net income tax provision (benefit) for the year ended March 31, 2026.

(2) State taxes in California, Texas, and New Jersey are attributable to greater than 50% of the net income tax provision (benefit) for the year ended March 31, 2025.

(3) State taxes in California, Texas and Maryland are attributable to greater than 50% of the net income tax provision (benefit) for the year ended March 31, 2024.

The effective tax rates for the years ended March 31, 2026, 2025 and 2024 were 22.5%, 23.7% and 27.0%, respectively. As compared with the statutory rate for the year ended March 31, 2026, the provision for income taxes was primarily impacted by state tax expense (net of federal benefits), which increased the provision by $5.5 million and effective rate by 3.8%; executive compensation limitation, which increased the provision by $1.7 million and the effective tax rate by 1.2%; and Canada's foreign tax effect, driven primarily by an impairment impact of $1.2 million and 0.8%, which increased the provision by $1.7 million and the effective tax rate by 1.2%. This was partially offset by UTP which decreased the provision by $5.2 million ($6.4 million UTP release offset by $1.0 million of additional penalties and interest, net of state tax benefit) and the effective tax rate by 3.6%.

As compared with the statutory rate for the year ended March 31, 2025, the provision for income taxes was primarily impacted by the state tax expense, which increased the provision by $6.3 million and the effective rate by 3.5%, executive compensation limitation, which increased the provision by $2.1 million and the effective rate by 1.1%. This was offset by UTP, which decreased the provision by $2.3 million ($3.6 million UTP release offset by $1.3 million additional penalties and interest) and the effective tax rate by 1.3%; tax benefits related to restricted stock vesting, which decreased the provision by $1.4 million and the effective tax rate of 0.8% and IRC section 250 deductions, which decreased the provision by $1.2 million and the effective tax rate of 0.7%.

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at March 31, 2026 and 2025 are presented below (in thousands):


	March 31,
	2026		2025
Deferred tax assets:
Operating lease liabilities	$	17,603	$	16,461
Accrued compensation	7,390		6,197

Pension and other employee benefits	1,563		554
Inventory reserves	8,103		4,938

Accrued expenses	4,530		823
Credits and carryforwards	1,222		441
Capitalized R&D	—		1,859
Transaction Costs	2,563		1,863
Other, net	2,186		1,067
Deferred tax assets	45,160		34,203
Valuation allowance	(459)		(444)
Deferred tax assets, net of valuation allowance	44,701		33,759

Deferred tax liabilities:
Goodwill and intangible assets	(110,463)		(60,979)
Property, plant and equipment	(9,687)		(7,462)
Operating lease right-of-use assets	(15,931)		(14,681)
Repatriation reserve	(2,345)		(2,079)
Other, net	(3,600)		(896)
Deferred tax liabilities	(142,026)		(86,097)
Net deferred tax liabilities	$	(97,325)	$	(52,338)

As of March 31, 2026, we maintained an immaterial valuation allowance related to foreign capital loss carryforwards. As of March 31, 2025, we recorded an immaterial valuation allowance related to foreign capital loss carryforwards, released the valuation allowance related to foreign tax credits and recorded an additional valuation allowance related to loss carryforwards that we do not expect to be able to realize.

A provision was made for taxes that may become payable upon distribution of earnings from our foreign subsidiaries. Deferred income tax has not been recognized on any remaining basis difference that is permanently invested outside the United States.

A reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest and penalties, is as follows (in thousands):


	March 31,
	2026		2025
Balance at beginning of year	$	8,396	$	10,877


Decreases related to lapses of statute of limitations	(3,913)		(2,481)

Balance at end of year	$	4,483	$	8,396

During the year ended March 31, 2026, we released a reserve of $6.4 million including accrued interest of $1.5 million and accrued penalty of $1.0 million, as a result of the lapse of statute for the 2018, 2020 and 2021 periods. We also recorded additional accrued interest of $0.9 million and accrued penalty of $0.1 million on historical tax positions, as well as an additional $1.1 million reserve and a corresponding tax indemnification asset in connection with the Falcon ($0.1 million) and Aspen ($1.0 million) acquisitions.

During the year ended March 31, 2025, we released a reserve of $3.6 million, including accrued interest of $0.6 million and accrued penalties of $0.5 million as a result of the lapse of the statute for the 2019 and 2020 periods. We also recorded additional accrued interest of $1.2 million, net of state benefit, and accrued penalty of $0.2 million on historical tax positions.

In connection with the Falcon acquisition that closed in October 2022, the Company recognized a UTP of $3.0 million related to pre-acquisition tax periods. In addition, in accordance with the tax indemnification provided by the seller to the Company for up to $4.5 million related to UTPs taken in pre-acquisition years, we recognized an initial tax indemnification asset of $3.0 million which will either be settled or expire upon the closure of the tax statutes for the pre-acquisition periods. During the three months ended December 31, 2025 and 2024, as a result of the statute expiration, $1.4 million and $0.9 million UTPs were released, respectively, and the corresponding tax indemnification assets expired concurrently and were recognized as non-cash other expenses on the statement of income, which is not deductible for income tax purposes. As of March 31, 2026, the UTP reserve and offsetting indemnification asset related to Falcon's pre-acquisition period were $0.6 million. The Falcon UTP reserves and offsetting indemnification asset will either be settled or expire upon the closure of the tax statutes for the pre-acquisition period.

In connection with the T.A. Industries, Inc. ("TRUaire") closed in December 2020, the Company recognized a UTP of $17.3 million million related to pre-acquisition tax periods. In addition, in accordance with the tax indemnification provided by the seller to the Company for up to $12.5 million related to UTPs taken in pre-acquisition years, we recognized a tax indemnification asset of $12.5 million, $5.0 million of which was released in the three months ended March 31, 2021. During the three months ended December 31, 2025 and 2024, $5.0 million and $2.7 million UTP accruals (including penalties and interests accrued post-acquisition), respectively, were released due to the expiration of the tax statutes and were recorded as income tax benefits. As of March 31, 2026, the UTP accrual related to TRUaire's pre-acquisition tax periods was $8.6 million and is expected to be released in the future as the statutes on the open tax years expire.

The Company expects $6.4 million of existing reserves for UTPs to either be settled or expire within the next 12 months as the statutes of limitations expire. Our federal income tax returns remain subject to examination for the years ended March 31, 2025, 2024 and 2023. Our income tax returns for Falcon's pre-acquisition periods including calendar years 2022 (partial year), 2021, 2020 and 2019 remain subject to examinations. Our income tax returns for TRUaire's pre-acquisition periods including calendar years 2017, 2018, 2019 and 2020 remain subject to examinations. Our income tax returns in certain state income tax jurisdictions remain subject to examination for various periods for the period ended September 30, 2015 and subsequent years.

- Definition

The entire disclosure for income tax.

+ References

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+ Details

SEGMENTS

12 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

SEGMENTS

As described in Note 1, we conduct our operations through three reportable segments:

•Contractor Solutions

•Specialized Reliability Solutions and

•Engineered Building Solutions

The following is a summary of the financial information of our reporting segments reconciled to the amounts reported in the consolidated financial statements (in thousands).


Year Ended March 31, 2026
(in thousands)	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Subtotal - Reportable Segments		Eliminations and Other		Total
Revenues, net to external customers	$	802,703	$	159,954	$	119,892	$	1,082,549	$	—	$	1,082,549
Intersegment revenue	7,613		156		20		7,789		(7,789)		—
Cost of revenues	458,749		103,214		74,693		636,656		(7,789)		628,867
Selling, general, and administrative expenses	175,891		34,817		30,771		241,479		28,041		269,520
Impairment expense	—		—		15,627		15,627		—		15,627
Operating income	175,676		22,079		(1,179)		196,576		(28,041)		168,535
Depreciation and amortization	59,408		5,725		1,827		66,960		112		67,072
Capital expenditures	12,665		3,528		886		17,079		178		17,257

In the fiscal quarter ended March 31, 2026, as discussed in Note 7, we recorded $13.6 million impairment expenses, net of tax, relating to goodwill, intangibles and long-lived assets, included in impairment expense, and additional expenses related to the Greco Canada Exit of $0.5 million and $1.0 million, net of tax, included in cost of revenues and selling, general and administrative expenses, respectively, for our Engineered Building Solutions segment.


Year Ended March 31, 2025
(in thousands)	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Subtotal - Reportable Segments		Eliminations and Other		Total
Revenues, net to external customers	$	609,706	$	147,476	$	121,119	$	878,301	$	—	$	878,301
Intersegment revenue	7,626		166		—		7,792		(7,792)		—
Cost of revenues	326,611		93,941		72,229		492,781		(7,792)		484,989
Selling, general, and administrative expenses	124,828		31,028		29,703		185,559		26,505		212,064
Operating income	165,893		22,673		19,187		207,753		(26,505)		181,248
Depreciation and amortization	34,666		5,553		1,826		42,045		177		42,222
Capital expenditures	12,667		2,453		1,040		16,160		106		16,266

In the fiscal quarter ended March 31, 2025, we recorded a $1.6 million increase in fair value of contingent consideration liability related to the PSP Products acquisition, net of tax, included in selling, general and administrative expenses, for our Contractor Solutions segment.


Year Ended March 31, 2024
(in thousands)	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Subtotal - Reportable Segments		Eliminations and Other		Total
Revenues, net to external customers	$	528,641	$	149,458	$	114,741	$	792,840	$	—	$	792,840
Intersegment revenue	7,853		155		—		8,008		(8,008)		—
Cost of revenues	286,203		95,894		68,006		450,103		(8,008)		442,095
Selling, general, and administrative expenses	106,746		31,453		28,031		166,230		23,889		190,119
Impairment expenses	1,508		—		—		1,508		—		1,508
Operating income	142,037		22,266		18,704		183,007		(23,889)		159,118
Depreciation and amortization	30,231		6,074		1,812		38,117		173		38,290
Capital expenditures	8,754		5,602		2,146		16,502		73		16,575

In the fiscal quarter ended March 31, 2024, we recorded a $1.1 million impairment relating to a trademark, net of tax, included in impairment expenses for our Contractor Solutions segment.


TOTAL ASSETS
(Amounts in thousands)	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Subtotal - Reportable Segments		Eliminations and Other		Total
March 31, 2026	$	2,046,280	$	179,908	$	69,178	$	2,295,366	$	21,318	$	2,316,684
March 31, 2025	941,087		145,663		81,347		1,168,097		210,968		1,379,065
March 31, 2024	806,261		139,968		81,256		1,027,485		15,841		1,043,326

Geographic information – We attribute revenues to different geographic areas based on the destination of the product or service delivery. Long-lived assets are classified based on the geographic area in which the assets are located. No individual country, except for the U.S., accounted for more than 10% of consolidated net revenues or total long-lived assets.

Revenues and long-lived assets by geographic area are as follows (in thousands, except percent data):


	Year Ended March 31,
	2026				2025				2024
U.S.	$	968,626	89.5	%	$	771,018	87.8	%	$	703,282	88.7	%
Non-U.S. (a)	113,923		10.5	%	107,283		12.2	%	89,558		11.3	%
Revenues, net	$	1,082,549	100.0	%	$	878,301	100.0	%	$	792,840	100.0	%

(a) No individual country within this group represents 10% or more of consolidated totals for any period presented.


	Year Ended March 31,
	2026				2025				2024
U.S.	$	1,702,636	98.6	%	$	748,303	95.2	%	$	672,887	94.5	%
Non-U.S.	24,982		1.4	%	37,901		4.8	%	39,030		5.5	%
Long-lived assets (a)	$	1,727,618	100.0	%	$	786,204	100.0	%	$	711,918	100.0	%

(a) Long-lived assets consist primarily of property, plant and equipment, intangible assets, goodwill and other assets.

Major customer information – We have a large number of customers across our locations and we do not have sales to any individual customer that represented 10% or more of consolidated net revenues for any of the fiscal years presented.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

LONG-TERM DEBT AND COMMITMENTS (Tables)

12 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

Debt consists of the following (in thousands):


	March 31,
	2026		2025
Revolving Credit Facility, interest rate of 5.42% (a) and N/A (b)	$	279,000	$	—
Senior Secured Term Loan A, interest rate of 5.29% (a) and N/A (b)	592,500		—
Total debt, gross	871,500		—
Less: Current portion	(29,458)		—
Less: Deferred TLA financing costs, net of amortization	(2,206)		—
Long-term debt	$	839,836	$	—

(a) Represents the interest rate effective on March 31, 2026, including the impact from the interest rate swap discussed in Note 11.

(b) Interest rate effective on March 31, 2025 was not applicable due to there being no outstanding balance under the Revolving Credit Facility and the non-existence of the Senior Secured Term Loan A at that date.

Schedule of Aggregate Maturities of Long-Term Debt

Future minimum debt payments are as follows for years ending March 31 (in thousands):


2027	$	30,000
2028	30,000
2029	30,000
2030	30,000
2031	751,500
Total	$	871,500

ORGANIZATION AND OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Property, Plant and Equipment, Net

Generally, the estimated useful lives of assets are:


Land improvements	5	to	40 years
Buildings and improvements	7	to	40 years
Plant, office and lab equipment	5	to	10 years

Property, plant and equipment, net, consist of the following (in thousands):


	March 31,
	2026		2025
Land and improvements	$	3,112	$	3,112
Buildings and improvements	57,782		56,982
Plant, office and laboratory equipment	165,378		136,244
Construction in progress	6,451		10,296
Other	365		—
	233,088		206,634
Less: Accumulated depreciation	(125,552)		(113,219)
Property, plant and equipment, net	$	107,536	$	93,415

INVENTORY (Tables)

12 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

Schedule of Inventories, Net

The Inventories, net caption in the Consolidated Balance Sheet is comprised of the following components:


	March 31,
	2026		2025
Raw materials and supplies	$	119,622	$	54,761
Work in process	4,823		5,969
Finished goods	200,700		144,897
Total inventories	325,145		205,627

Less: Obsolescence reserve	(15,438)		(10,751)
Inventories, net	$	309,707	$	194,876

CONSOLIDATION OF VARIABLE INTEREST ENTITIES AND REDEEMABLE NONCONTROLLING INTEREST (Tables)

12 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Variable Interest Entities

Whitmore JV's total net assets are presented below (in thousands):


	March 31, 2026		March 31, 2025
Cash	$	4,628	$	9,591
Accounts receivable, net	9,417		8,407
Inventories, net	4,997		4,823
Prepaid expenses and other current assets	2,033		254
Property, plant and equipment, net	14,228		13,452
Intangible assets, net	4,049		4,859
Other assets	725		598
Total assets	$	40,077	$	41,983

Accounts payable	$	7,250	$	7,755
Accrued and other current liabilities	2,247		1,605
Other long-term liabilities	786		413
Total liabilities	$	10,284	$	9,774

Schedule of Changes in Redeemable Noncontrolling Interest

Changes in redeemable noncontrolling interest for the year ended March 31, 2026 were as follows (in thousands):


	March 31, 2026		March 31, 2025
Balance at the beginning of the fiscal year	$	20,187	$	19,355

Net income attributable to redeemable noncontrolling interest	802		832
Distributions to redeemable noncontrolling interest	(2,000)		—


Ending balance	$	18,989	$	20,187

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

INCOME TAXES - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Effective Income Tax Rate Reconciliation [Line Items]
Income before income tax	$ 145,553	$ 180,117	$ 140,480
Amount
U.S. federal statutory tax rate	30,566	37,825	29,501
State and local income taxes	5,544	6,325	6,358
Nontaxable or nondeductible items
Foreign tax effects	1,200
Changes in unrecognized tax benefits ("UTP")	(5,229)	(2,288)	59
Provision for income taxes	$ 32,706	$ 42,633	$ 37,941
Percent
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State and local income taxes	3.80%	3.50%	4.50%
Nontaxable or nondeductible items
Foreign tax effects	0.80%
Changes in unrecognized tax benefits ("UTP")	(3.60%)	(1.30%)	0.00%
Income tax expense	22.50%	23.70%	27.00%
U.S.
Amount
Effect of cross-border tax laws	$ (758)	$ (908)	$ (345)
Tax credits	(389)	(274)	(21)
Changes in valuation allowances	0	(216)	(132)
Nontaxable or nondeductible items
Executive compensation limitation	1,731	2,062	2,070
Indemnification asset	269	124	1,789
Other	289	(1,453)	(541)
Other adjustments	$ (750)	$ 286	$ (1,856)
Percent
Effect of cross-border tax laws	(0.50%)	(0.50%)	(0.20%)
Tax credits	(0.30%)	(0.20%)	0.00%
Changes in valuation allowances	0.00%	(0.10%)	(0.10%)
Nontaxable or nondeductible items
Executive compensation limitation	1.20%	1.10%	1.50%
Indemnification asset	0.20%	0.10%	1.30%
Other	0.20%	(0.80%)	(0.40%)
Other adjustments	(0.50%)	0.20%	(1.30%)
Canada
Nontaxable or nondeductible items
Foreign tax effects	$ 1,722	$ 607	$ 1,119
Nontaxable or nondeductible items
Foreign tax effects	1.20%	0.30%	0.80%
Other foreign jurisdictions
Nontaxable or nondeductible items
Foreign tax effects	$ (289)	$ 543	$ (60)
Nontaxable or nondeductible items
Foreign tax effects	(0.20%)	0.30%

ACQUISITIONS (Tables)

12 Months Ended

Mar. 31, 2026

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

Schedule of Estimate of the Aggregate Fair Value of Assets Acquired and Liabilities Assumed

The following table summarizes the Company's best initial estimate of the aggregate fair value of the assets acquired and liabilities assumed at the date of acquisition (in thousands):


	Initial Estimated Fair Value		Measurement Period Adjustments		Updated Estimated Fair Value
Cash	$	5,973	$	—	$	5,973
Accounts Receivable	16,296		19		16,315
Inventory	54,520		(2,167)		52,353
Income Tax Receivable	1,934		1,028		2,962
Other Current Assets	1,606		(510)		1,096
Property, Plant and Equipment	6,644		—		6,644
Trade Name (indefinite life)	45,000		(8,000)		37,000
Customer Lists (useful life of 15 years)	349,000		5,000		354,000
Right-Of-Use Assets	5,205		—		5,205

Other Long-Term Assets	635		—		635
Accounts Payable	(7,645)		(1,682)		(9,327)
Accrued and Other Current Liabilities	(10,729)		231		(10,498)
Lease Liabilities - Short-Term	(1,341)		—		(1,341)

Deferred Tax Liabilities	(60,679)		10,046		(50,633)

Lease Liabilities - Long-Term	(3,864)		—		(3,864)

Estimated fair value of net assets acquired	402,555		3,965		406,520
Goodwill	264,981		(13,365)		251,616
Total Purchase Price	$	667,536	$	(9,400)	$	658,136

The following table summarizes the Company's best initial estimate of the aggregate fair value of the assets acquired and liabilities assumed at the date of acquisition (in thousands):


	Initial Estimated Fair Value		Measurement Period Adjustments		Updated Estimated Fair Value
Cash	$	2,289	$	—	$	2,289
Accounts Receivable	15,253		(62)		15,191
Inventory	30,851		310		31,161

Other Current Assets	150		—		150
Property, Plant and Equipment	7,916		—		7,916
Trade Name (indefinite life)	22,000		—		22,000
Customer Lists (useful life of 15 years)	165,000		—		165,000
Right-Of-Use Assets	11,855		—		11,855
Long-Term Indemnity Asset	400		572		972
Deferred Tax Assets	—		1,532		1,532
Accounts Payable	(5,459)		—		(5,459)
Accrued and Other Current Liabilities	(8,943)		(157)		(9,100)
Lease Liabilities - Short-Term	(1,019)		—		(1,019)


Contingency Reserve	(400)		(572)		(972)
Lease Liabilities - Long-Term	(10,836)		—		(10,836)
Other Long-Term Liabilities	(3,600)		—		(3,600)
Estimated fair value of net assets acquired	225,457		1,624		227,080
Goodwill	100,421		72		100,493
Total Purchase Price	$	325,878	$	1,696	$	327,573

Schedule of Unaudited Proforma Financial Information

Pursuant to Topic 805, unaudited supplemental proforma results of operations for the years ended March 31, 2026 and 2025, as if the acquisitions of MARS Parts and Aspen Manufacturing had occurred on April 1, 2024, are presented below (in thousands, except per share amounts):


	Year Ended March 31,
	2026		2025
Revenue, net	$	1,232,737	$	1,207,036
Net income attributable to CSW	124,394		115,238

Net income per share attributable to CSW
Basic	$	7.47	$	7.10
Diluted	$	7.44	$	7.06

LONG-TERM DEBT AND COMMITMENTS - Narrative (Details)				12 Months Ended
LONG-TERM DEBT AND COMMITMENTS - Narrative (Details)	May 02, 2025 USD ($)	May 18, 2021	Dec. 11, 2015 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Nov. 04, 2025 USD ($)	Feb. 07, 2023 USD ($)	Dec. 15, 2022 USD ($)
Debt Instrument [Line Items]
Borrowings on lines of credit				$ 505,724,000	$ 32,723,000	$ 112,319,000
Repayments of lines of credit				(226,724,000)	(198,723,000)	$ (199,319,000)
Total debt, gross				871,500,000	0
Interest rate swap
Debt Instrument [Line Items]
Amount of hedged item				300,000,000.0			$ 300,000,000.0	$ 100,000,000.0
Senior Notes \| Senior Secured Term Loan A
Debt Instrument [Line Items]
Debt discount and issuance costs							2,400,000
Debt instrument, face amount							$ 600,000,000.0
Total debt, gross				592,500,000	0
Amortization installments, percentage pf aggregate principal							1.25%
Amortization installments, portion of aggregate principal, amount							$ 7,500,000
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Debt instrument term			5 years
Maximum borrowing capacity	$ 700,000,000.0		$ 250,000,000.0						$ 500,000,000.0
Line of credit facility, accordion feature	250,000,000.0		$ 50,000,000.0						50,000,000.0
Debt discount and issuance costs	$ 2,700,000								$ 700,000
Percentage of voting equity interests in first-tier foreign subsidiaries (in percent)	65.00%
Debt instrument, face amount							$ 700,000,000.0
Borrowings on lines of credit				505,700,000
Repayments of lines of credit				(226,700,000)
Total debt, gross				279,000,000	0
Line of credit facility, remaining borrowing capacity				$ 419,700,000	$ 498,700,000
Maximum leverage ratio		3.50
Temporary increase for maximum leverage ratio		4.00
Duration of temporary increase for maximum leverage ratio		18 months
Minimum fixed charge coverage ratio		3.00
Revolving Credit Facility \| Line of Credit \| Federal Funds Effective Rate
Debt Instrument [Line Items]
Spread on interest rate (in percent)	0.50%
Revolving Credit Facility \| Line of Credit \| LIBOR
Debt Instrument [Line Items]
Spread on interest rate (in percent)	1.00%
Revolving Credit Facility \| Line of Credit \| Minimum
Debt Instrument [Line Items]
Commitment fee percentage (in percent)	0.15%
Revolving Credit Facility \| Line of Credit \| Minimum \| Prime Rate
Debt Instrument [Line Items]
Spread on interest rate (in percent)	0.25%
Revolving Credit Facility \| Line of Credit \| Minimum \| London Interbank Offered Rate
Debt Instrument [Line Items]
Spread on interest rate (in percent)	1.25%
Revolving Credit Facility \| Line of Credit \| Maximum
Debt Instrument [Line Items]
Commitment fee percentage (in percent)	0.40%
Revolving Credit Facility \| Line of Credit \| Maximum \| Prime Rate
Debt Instrument [Line Items]
Spread on interest rate (in percent)	1.50%
Revolving Credit Facility \| Line of Credit \| Maximum \| London Interbank Offered Rate
Debt Instrument [Line Items]
Spread on interest rate (in percent)	2.50%
Letter of Credit \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 30,000,000.0
Swingline Loans \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 15,000,000.0

ORGANIZATION AND OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION AND OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

CSW is a diversified industrial growth company with a strategic focus on providing niche, value-added products in the end markets we serve. We operate in three business segments: Contractor Solutions, Specialized Reliability Solutions and Engineered Building Solutions. Our products include mechanical products for heating, ventilation, air conditioning and refrigeration ("HVAC/R"), plumbing products, grilles, registers and diffusers ("GRD"), building safety solutions and high-performance specialty lubricants and sealants. End markets that we serve include HVAC/R, architecturally-specified building products, general industrial, plumbing, energy, rail transportation, mining and electrical. Drawing on our innovative and proven technologies, we seek to deliver solutions to our professional customers that require superior performance and reliability. The reputation of our product portfolio is built on more than 100 well-respected brand names, such as AC Guard®, Air Sentry®, Aspen ManufacturingTM, Balco®, Cover Guard®, Deacon®, Duckt-Strip®, Dust Free®, Falcon Stainless®, Greco®, Hydrotex®, Jet-Lube®, Kopr-Kote®, Leak Freeze®, MARS®, Metacaulk®, No. 5®, OilSafe®, PF WaterWorksTM, ProAction Fluids®, PSP ProductsTM, RectorSeal®, Safe-T-Switch®, Shoemaker Manufacturing®, Smoke Guard®, TRUaire®, Turbo 200®, and Whitmore®.

Since February 2025, the President of the United States has issued various executive orders to regulate imports by imposing country-specific tariffs on multiple nations around the world, including Vietnam and China, which are relevant to our business due to our manufacturing presence in Vietnam and our use of third-party manufacturing in China and other foreign countries. In addition, the United States has imposed and/or reimposed certain commodity-specific tariffs, including tariffs on steel, aluminum and copper, which are used as inputs for some of our products. We have responded by negotiating cost reductions with certain suppliers, transitioning certain sources of supply, and by raising prices to our customers on certain products across our three segments to partially offset the impact. In February 2026, the U.S. Supreme Court issued a decision invalidating tariffs imposed under the International Emergency Economic Powers Act ("IEEPA"). The ruling may allow for recovery of IEEPA tariff amounts previously paid, although the timing and administration of any potential IEEPA tariff refunds is uncertain and may be subject to further legal and regulatory developments. We are assessing our potential refund rights and are pursuing for a recovery of amounts paid; however this recovery will likely be subject to applicable procedures and may add complexity and uncertainty into our operations. Additionally, the current presidential administration has imposed tariffs on goods imported into the United States pursuant to legislative authorities other than IEEPA and has indicated that it may continue to pursue these policies in the future. The current situation is dynamic, and the ultimate effect will be dependent on the magnitude and duration of the tariffs and the countries implicated, as well as our ability to mitigate their impact, where we continue to actively assess and implement mitigation options.

The ongoing conflict in the Middle East, including active military operations in Iran beginning February 28, 2026, has contributed to disruptions in global shipping lanes, particularly through the Strait of Hormuz and the broader Persian Gulf region. While we do not source materials directly from Iran or the Persian Gulf region, the conflict has contributed to elevated crude oil prices, ocean and domestic freight and certain commodity costs and extended lead times from Asian suppliers as carriers reroute through alternative passages including the Cape of Good Hope. We are working with our logistics partners to mitigate these impacts and do not currently believe they will have a material adverse effect on our ability to meet customer demand, though we continue to monitor the situation closely.

Basis of Presentation – The consolidated financial position, results of operations and cash flows included in this Annual Report on Form 10-K for the fiscal year ended March 31, 2026 (“Annual Report”) include all revenues, costs, assets and liabilities directly attributable to CSW and have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”). The consolidated financial statements are for us and our consolidated subsidiaries, each of which is a wholly-owned subsidiary, except our 50% investment in a variable interest entity for which we have determined that we are the primary beneficiary and therefore have consolidated into our financial statements. All significant intercompany transactions have been eliminated in consolidation.

Variable Interest Entities - We evaluate whether an entity is a variable interest entity (“VIE”) and determine if the primary beneficiary status is appropriate on a quarterly basis. We consolidate a VIE for which we are the primary beneficiary. When assessing the determination of the primary beneficiary, we consider all relevant facts and circumstances, including: the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance, the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. Through this evaluation, we determined that the Whitmore JV is a VIE and the Company is the primary beneficiary of this VIE, primarily due to Whitmore having the power to direct the manufacturing activities, which are considered the most significant activities for the Whitmore JV.

Use of Estimates – The process of preparing financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect reported amounts of certain assets, liabilities, revenues and expenses. We believe our estimates and assumptions are reasonable; however, actual results may differ materially from such estimates. The most significant estimates and assumptions are used in determining:

•Deferred taxes and tax reserves; and

•Valuation of goodwill and indefinite-lived intangible assets.

Cash and Cash Equivalents – We consider all highly liquid instruments purchased with original maturities of three months or less and money market accounts to be cash equivalents. We maintain our cash and cash equivalents at financial institutions for which the combined account balances in individual institutions may exceed insurance coverage and, as a result, there is a concentration of credit risk related to amounts on deposit in excess of insurance coverage. We had deposits in domestic banks of $13.3 million and $214.8 million at March 31, 2026 and 2025, respectively, and balances of $20.5 million and $11.0 million were held in foreign banks at March 31, 2026 and 2025, respectively.

Accounts Receivable, Allowance for Credit Losses and Credit Risk – Trade accounts receivables are recorded at the invoiced amounts and do not bear interest. We record an allowance for credit losses on trade receivables that, when deducted from the gross trade receivables balance, presents the net amount expected to be collected. We estimate the allowance based on an aging schedule and according to historical losses as determined from our billings and collections history. This may be adjusted after consideration of customer-specific factors such as financial difficulties, liquidity issues or insolvency, as well as both current and forecasted macroeconomic conditions as of the reporting date. We adjust the allowance and recognize credit losses in the income statement each period. Trade receivables are written off against the allowance in the period when the receivable is deemed to be uncollectible. Subsequent recoveries of amounts previously written off are reflected as a reduction to periodic credit losses in the income statement. Our allowance for expected credit losses for trade receivables as of March 31, 2026 was $2.3 million, compared to $1.1 million as of March 31, 2025.

Credit risks are mitigated by the diversity of our customer base across many different industries and by performing creditworthiness analyses on our customers. Additionally, we mitigate credit risk through letters of credit and advance payments received from our customers. We do not believe that we have any significant concentrations of credit risk.

Inventories and Related Reserves – Inventories are stated at the lower of cost or net realizable value and include raw materials, supplies, direct labor and manufacturing overhead. Inventories are accounted for using a standard costing methodology, which approximates cost on a first-in, first-out (“FIFO”) basis.

Reserves are provided for slow-moving or excess and obsolete inventory based on the difference between the cost of the inventory and its net realizable value and by reviewing quantities on hand in comparison with historical and expected future usage. In estimating the reserve for excess or slow-moving inventory, management considers factors such as product aging, current and future customer demand and market conditions.

Property, Plant and Equipment – Property, plant and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the individual assets. When property, plant and equipment are retired or otherwise disposed of, the related cost and accumulated depreciation are removed from the accounts, and the resulting gain or loss is included in income from operations for the period. Generally, the estimated useful lives of assets are:


Land improvements	5	to	40 years
Buildings and improvements	7	to	40 years
Plant, office and lab equipment	5	to	10 years

We review property, plant and equipment for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable.

Repairs and maintenance costs are expensed as incurred, and significant improvements that either extend the useful life or increase the capacity or efficiency of property and equipment are capitalized and depreciated.

Business Held for Sale - We classify a business, comprised of assets and liabilities, as held for sale in the period in which the following six criteria are met: (i) management, having the authority to approve the action, commits to a plan to sell the property; (ii) the business is available for immediate sale in its present condition, subject only to terms that are usual and customary; (iii) an active program to locate a buyer and other actions required to complete the plan to sell have been initiated; (iv) the sale of the business is probable and is expected to be completed within one year; (v) the business is being actively marketed for sale at a price that is reasonable in relation to its current fair value; and (vi) actions necessary to complete the plan of sale indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn.

Exit and Disposal Activities - The Company accounts for costs associated with exit or disposal activities in accordance with ASC 420, Exit or Disposal Cost Obligations. A liability for costs associated with an exit or disposal activity is recognized and measured at fair value in the period in which the liability is incurred. One-time employee termination benefits are recognized at the communication date if employees are not required to render service beyond a minimum retention period, or ratably over the future service period if employees are required to render future service to receive the benefit. Contract termination costs, including costs to terminate an operating lease, are recognized and measured at fair value when the Company either terminates the contract or ceases using the rights conveyed under the contract. Other associated costs, including facility consolidation and relocation costs, are recognized and measured at fair value in the period in which they are incurred.

Valuation of Goodwill and Intangible Assets – The value of goodwill is tested for impairment at least annually as of January 31 or whenever events or circumstances indicate such assets may be impaired. The identification of our reporting units began at the operating segment level and considered whether components one level below the operating segment levels should be identified as reporting units for purpose of testing goodwill for impairment based on certain conditions. These conditions included, among other factors, (i) the extent to which a component represents a business and (ii) the aggregation of economically similar components within the operating segments. Other factors that were considered in determining whether the aggregation of components was appropriate included the similarity of the nature of the products and services, the nature of the production processes, the methods of distribution and the types of industries served.

Accounting Standards Codification ("ASC") 350 allows an optional qualitative assessment, prior to a quantitative assessment test, to determine whether it is more likely than not that the fair value of a reporting unit exceeds its carrying amount. We bypassed the qualitative assessment and proceeded directly to the quantitative test. If the carrying value of a reporting unit exceeds it fair value, the goodwill of that reporting unit is impaired and an impairment loss is recorded equal to the excess of the carrying value over its fair value. We estimate the fair value of our reporting units based on an income approach, whereby we calculate the fair value of a reporting unit base on the present value of estimated future cash flows. A discounted cash flow analysis requires us to make various judgmental assumptions about future sales, operating margins, growth rates and discount rates, which are based on our budgets, business plans, economic projections, anticipated future cash flows and market participants and are considered non-recurring Level III inputs within the fair value hierarchy. $7.5 million of impairment loss was recognized as a result of the impairment tests for the year ended March 31, 2026, and no impairment for fiscal years ended March 31, 2025 or 2024.

We have intangible assets consisting of patents, trademarks, customer lists and non-compete agreements. Definite-lived intangible assets are assessed for impairment whenever events or changes in circumstances indicate the carrying amount may not be recoverable. In addition, we have other trademarks that are considered to have indefinite lives. We test indefinite-lived intangible assets for impairment at least annually as of January 31 or whenever events or circumstances indicate that the carrying amount may not be recoverable. Significant assumptions used in the impairment test include the discount rate, royalty rate, future sales projections and terminal value growth rate. These inputs are considered non-recurring Level III inputs within the fair value hierarchy. An impairment loss would be recognized when the estimated future discounted cash flows are less than their carrying amount. We recorded a $6.6 million impairment of a trademark and customer lists for the year ended March 31, 2026, no impairment for the year ended March 31, 2025 and a $1.5 million impairment of a trademark for the fiscal year ended March 31, 2024.

Property Held for Investment – One of our operating subsidiaries holds and manages a non-operating property, which is valued at lower of cost or market and will be disposed of as opportunities arise to maximize value.

Deferred Loan Costs – Deferred loan costs related to our Revolving Credit Facility (or "RCF"' as defined in Note 9) are presented in other assets and deferred loan costs related to our Senior Secured Term Loan A (or "TLA" as defined in Note 9) are presented as a direct reduction from the carrying value of the term loan. Deferred loan costs consist of fees and other expenses associated with debt financing and are amortized over the term of the associated debt using the effective interest method.

Fair Values of Financial Instruments – Our financial instruments are presented at fair value in our consolidated balance sheets, with the exception of our long-term debt, as discussed in Note 9. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available, valuation models may be applied.

Assets and liabilities recorded at fair value in our consolidated balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair values. Hierarchical levels, as defined by Accounting Standards Codification (“ASC”) 820, “Fair Value Measurements and Disclosures,” are directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities. An asset or a liability’s categorization within the fair value hierarchy is based on the lowest level of significant input to its valuation. Hierarchical levels are as follows:

Level I – Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Level II – Inputs (other than quoted prices included in Level I) are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.

Level III – Inputs reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

Recurring fair value measurements include redeemable noncontrolling interest, investments in derivative instruments and contingent consideration liability. The redemption value of the redeemable noncontrolling interest is estimated using a discounted cash flow analysis, which requires management judgment with respect to future revenue, operating margins, growth rates and discount rates and is classified as Level III under the fair value hierarchy. The fair value measurements of our derivative instruments are determined using models that maximize the use of the observable market inputs including interest rate curves, and are classified as Level II under the fair value hierarchy.

The redemption value of the redeemable noncontrolling interest is included in Note 3. The fair values of our derivative instruments are included in Note 11.

Contingent Consideration – The fair value of the contingent consideration liability is determined using either a scenario-based analysis on forecasted future results or an option pricing model simulation that determines an average projected payment value across numerous iterations. The contingent consideration liability is initially recorded at fair value on the acquisition date and is remeasured quarterly based on the then assessed fair value, with any change in the fair value recorded in selling, general and administrative expenses in the Consolidated Statements of Operations and in cash flows from operating activities in the Consolidated Statements of Cash Flows. Contingent consideration payments are reported in cash flows from financing activities in the Consolidated Statements of Cash Flows. The change in the fair value of the contingent consideration can result from changes in future operations, forecasted revenue and in assumed discount rates. The fair value measurement is based on significant inputs that are not observable in the market and is classified as Level III under the fair value hierarchy. The fair values of contingent consideration liability are discussed in Note 14. As of March 31, 2026 and 2025, the contingent consideration liability reported in the balance sheets was $16.7 million and $24.4 million, respectively.

Leases – We determine if a contract is or contains a lease at inception by evaluating whether the contract conveys the right to control the use of an identified asset. Right-of-Use (“ROU”) assets and lease liabilities are initially recognized at the commencement date based on the present value of remaining lease payments over the lease term calculated using our incremental borrowing rate, unless the implicit rate is readily determinable. ROU assets represent the right to use an underlying asset for the lease term, including any upfront lease payments made and excluding lease incentives. Lease liabilities represent the obligation to make future lease payments throughout the lease term. As most of our operating leases do not provide an implicit rate, we apply our incremental borrowing rate to determine the present value of remaining lease payments. Our incremental borrowing rate is determined based on information available at the commencement date of the lease. The lease term includes renewal periods when we are reasonably certain to exercise the option to renew. The ROU asset is amortized over the expected lease term. Lease and non-lease components, when present on our leases, are accounted for separately. Leases with an initial term of 12 months or less are excluded from recognition in the balance sheet, and the expense for these short-term leases and for operating leases is recognized on a straight-line basis over the lease term. We have certain lease contracts with terms and conditions that provide for variability in the payment amount based on changes in facts or circumstances occurring after the commencement date. These variable lease payments are recognized in our consolidated income statements as the

obligation is incurred. As of March 31, 2026, we did not have material leases that imposed significant restrictions or covenants, material related party leases or sale-leaseback arrangements.

Derivative Instruments and Hedge Accounting – We do not use derivative instruments for trading or speculative purposes. We enter into interest rate swap agreements for the purpose of hedging our cash flow exposure to floating interest rates on certain portions of our debt. All derivative instruments are recognized on the balance sheet at their fair values. Changes in the fair value of a designated interest rate swap are recorded in other comprehensive loss until earnings are affected by the underlying hedged item. Any ineffective portion of the gain or loss is immediately recognized in earnings. Upon settlement, realized gains and losses are recognized in interest expense in the consolidated statements of operations. Cash flows associated with interest rate swap agreements designated as cash flow hedges are classified within operating activities in the Consolidated Statements of Cash Flows.

We discontinue hedge accounting when (1) we deem the hedge to be ineffective and determine that the designation of the derivative as a hedging instrument is no longer appropriate; (2) the derivative matures, terminates or is sold; or (3) occurrence of the contracted or committed transaction is no longer probable or will not occur in the originally expected period. When hedge accounting is discontinued and the derivative remains outstanding, we carry the derivative at its estimated fair value on the balance sheet, recognizing changes in the fair value in current period earnings. If a cash flow hedge becomes ineffective, any deferred gains or losses remain in accumulated other comprehensive loss until the underlying hedged item is recognized. If it becomes probable that a hedged forecasted transaction will not occur, deferred gains or losses on the hedging instrument are recognized in earnings immediately.

We are exposed to risk from credit-related losses resulting from nonperformance by counterparties to our financial instruments. We perform credit evaluations of our counterparties under interest rate swap agreements and expect all counterparties to meet their obligations. If necessary, we adjust the values of our derivative contracts for our or our counterparties’ credit risk.

Pension Obligations – Determination of pension benefit obligations is based on estimates made by management in consultation with independent actuaries. Inherent in these valuations are assumptions including discount rates, expected rates of return on plan assets, retirement rates, mortality rates and rates of compensation increase and other factors, all of which are reviewed annually and updated if necessary. Current market conditions, including changes in rates of return, interest rates and medical inflation rates, are considered in selecting these assumptions. Actuarial gains and losses and prior service costs are recognized in accumulated other comprehensive loss as they arise, and we amortize these costs into net pension expense over the remaining expected service period. We used a measurement date of March 31 for all periods presented.

Redeemable Noncontrolling Interests - Noncontrolling interests with redemption features that are not solely within our control are considered redeemable noncontrolling interests. Our redeemable noncontrolling interest relates to Shell's 50% equity interest in the Whitmore JV and is classified in temporary equity that is reported between liabilities and shareholders' equity on our Consolidated Balance Sheets initially at its formation-date fair value. We adjust the redeemable noncontrolling interest each reporting period for the net income or loss attributable to the noncontrolling interest. We also make a measurement period adjustment, if any, to adjust the redeemable noncontrolling interest to the higher of the redemption value or carrying value each reporting period. These adjustments are recognized through retained earnings and are not reflected in net income or net income attributable to CSW. The redemption value of the redeemable noncontrolling interest is estimated using a discounted cash flow analysis, which requires management judgment with respect to future revenue, operating margins, growth rates and discount rates. Net income or loss attributable to the redeemable noncontrolling interests are presented as a separate line on the consolidated statements of operations which is necessary to identify the income or loss specifically attributable to CSW. The financial results and position of the redeemable noncontrolling interest acquired through the formation of the Whitmore JV are included in their entirety in our consolidated statements of operations and consolidated balance sheets beginning with the first quarter of fiscal 2022.

When calculating earnings per share attributable to CSW, we adjust net income attributable to CSW for the excess portion of the measurement period adjustment to the extent the redemption value exceeds both the carrying value and the fair value of the redeemable noncontrolling interest on a cumulative basis. Refer to Note 3 for further information regarding the redeemable noncontrolling interest.

Revenue Recognition – We recognize revenues to depict the transfer of control of promised goods or services to our customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods or services. Refer to Note 20 for further discussion. We recognize revenue when all of the following criteria have been met: (i) a contract with a customer exists, (ii) performance obligations have been identified, (iii) the price to the customer has been determined, (iv) the price to the customer has been allocated to the performance obligations, and (v) performance obligations are satisfied, which are more fully described below.

(i) We identify a contract with a customer when a sales agreement indicates approval and commitment of the parties; identifies the rights of the parties; identifies the payment terms; has commercial substance; and it is probable that we will collect the consideration to which we will be entitled in exchange for the goods or services that will be transferred to the customer. In most instances, our contract with a customer is the customer's purchase order. For certain customers, we may also enter into a sales agreement that outlines a framework of terms and conditions that apply to all future purchase orders for that customer. In these situations, our contract with the customer is both the sales agreement and the specific customer purchase order. Because our contract with a customer is typically for a single transaction or customer purchase order, the duration of the contract is one year or less. As a result, we have elected to apply certain practical expedients and, as permitted by GAAP, omit certain disclosures of remaining performance obligations for contracts that have an initial term of one year or less.

(ii) We identify performance obligations in a contract for each promised good or service that is separately identifiable from other promises in the contract and for which the customer can benefit from the good or service either on its own or together with other resources that are readily available to the customer. Goods and services provided to our customers that are deemed immaterial are included with other performance obligations.

(iii) We determine the transaction price as the amount of consideration we expect to be entitled to in exchange for fulfilling the performance obligations, including the effects of any variable consideration.

(iv) For any contracts that have more than one performance obligation, we allocate the transaction price to each performance obligation in an amount that depicts the amount of consideration to which we expect to be entitled in exchange for satisfying each performance obligation. We have excluded disclosure of the transaction price allocated to remaining performance obligations if the performance obligation is part of a contract that has an original expected duration of one year or less as the majority of our contracts are short-term in nature with a term of one year or less.

(v) We recognize revenue when, or as, we satisfy the performance obligation in a contract by transferring control of a promised good or service to the customer.

We exclude from the measurement of the transaction price all taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected from a customer. As such, we present revenue net of sales and other similar taxes. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are included in cost of revenues. Costs to obtain a contract, which include sales commissions recorded in selling, general and administrative expense, are generally expensed when incurred as the amortization period is one year or less. We do not have customer contracts that include significant financing components.

Research and Development ("R&D") – R&D costs are expensed as incurred. Costs incurred for R&D primarily include salaries and benefits and consumable supplies, as well as rent, professional fees, utilities and the depreciation of property and equipment used in R&D activities. R&D costs included in selling, general and administrative expense were $5.8 million, $5.3 million and $5.9 million for the years ended March 31, 2026, 2025 and 2024, respectively.

Advertising Costs – Advertising costs are expensed as incurred and included in selling, general and administrative expenses. For the years ended March 31, 2026, 2025 and 2024, advertising costs were $6.7 million, $4.7 million and $4.5 million, respectively.

Share-based Compensation – Share-based compensation is measured at the grant-date fair value. The exercise price of stock option awards and the fair value of restricted share awards are set at the closing price of our common stock on the Nasdaq Global Select Market on the date of grant, which is the date such grants are authorized by our Board of Directors. The fair value of performance-based restricted share awards is determined using a Monte Carlo simulation model incorporating all possible outcomes against the Russell 2000 Index. The fair value of share-based payment arrangements is amortized on a straight-line basis to compensation expense over the period in which the restrictions lapse based on the expected number of shares that will vest. Share-based compensation expense, net of estimated forfeitures, is included in selling, general and administrative expenses. The forfeiture rate is estimated upon grant and is adjusted when actual forfeitures occur. Upon the vesting of granted shares, the participants may elect to cover tax withholdings by selling back a portion of vested shares to the

Company. In such cases, we repurchase the shares from the participant to satisfy the minimum tax withholding requirements on their behalf and report such share repurchase as a financing cash outflow in the consolidated statement of cash flows. To cover the exercise of options and vesting of restricted shares, we generally issue new shares from our authorized but unissued share pool, although we may instead issue treasury shares in certain circumstances.

Income Taxes, Deferred Taxes and Tax Valuation Allowances – We apply the liability method in accounting and reporting for income taxes. Under the liability approach, deferred tax assets and liabilities are determined based upon the difference between the financial statement carrying amounts and the tax basis of assets and liabilities that will result in taxable or deductible amounts in the future based on enacted tax rates expected to be in effect when these differences are expected to reverse. The effect on deferred tax assets and liabilities resulting from a change in tax rates is recognized in the period that includes the enactment date. The deferred income tax assets are adjusted by a valuation allowance, if necessary, to recognize future tax benefits only to the extent, based on available evidence, that it is more likely than not to be realized. This analysis is performed on a jurisdictional basis and reflects our ability to utilize these deferred tax assets through a review of past, current and estimated future taxable income in addition to the establishment of viable tax strategies that will result in the utilization of the deferred assets.

We recognize income tax related interest and penalties, if any, as a component of income tax expense. We account for the effects of Global Intangible Low-Taxed Income ("GILTI") as a component of income tax expense in the period in which the tax is incurred.

Unremitted Earnings – As of fiscal year ended March 31, 2026, we assert that all of our foreign earnings of the U.K., Australian, Vietnam and Canadian subsidiaries will be remitted to the U.S. through distributions. A provision was made for taxes that may become payable upon distribution of earnings from our foreign subsidiaries. Deferred income tax has not been recognized on any remaining basis difference that is permanently invested outside the United States.

Uncertain Tax Positions – We establish income tax liabilities to remove some or all of the income tax benefit of any of our income tax positions based upon one of the following: (1) the tax position is not “more likely than not” to be sustained, (2) the tax position is “more likely than not” to be sustained, but for a lesser amount or (3) the tax position is “more likely than not” to be sustained, but not in the financial period in which the tax position was originally taken. The amount of income taxes we pay is subject to ongoing audits by federal, state, and foreign taxing authorities, which often result in proposed assessments. We establish reserves for open tax years for uncertain tax positions that may be subject to challenge by various taxing authorities. The consolidated tax provision and related accruals include the impact of such reasonably estimable losses and related interest and penalties as deemed appropriate.

We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities. The determination is based on the technical merits of the position and presumes that each uncertain tax position will be examined by the relevant taxing authority that has full knowledge of all relevant information. The tax benefits recognized in the financial statements from such a position are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement.

Earnings Per Share – We use the two-class method of calculating earnings per share, which determines earnings per share for each class of common stock and participating security as if all earnings of the period had been distributed. If the holders of restricted stock awards are entitled to vote and receive dividends during the restriction period, unvested shares of restricted stock qualify as participating securities and, accordingly, are included in the basic computation of earnings per share. Our unvested restricted shares participate on an equal basis with common shares; therefore, there is no difference in undistributed earnings allocated to each participating security. Accordingly, the presentation in Note 12 is prepared on a combined basis and is presented as earnings per common share. Diluted earnings per share is based on the weighted average number of shares as determined for basic earnings per share plus shares potentially issuable in connection with stock options and restricted stock awards not entitled to vote and receive dividends during the restriction period.

Foreign Currency Translation – Assets and liabilities of our foreign subsidiaries are translated to U.S. dollars at exchange rates prevailing at the balance sheet date, while income and expenses are translated at average rates for each month. Translation gains and losses are reported as a component of accumulated other comprehensive loss. Transactional currency gains and losses arising from transactions in currencies other than our sites’ functional currencies are included in our consolidated statements of operations.

Transaction and translation gains and losses arising from intercompany balances are reported as a component of accumulated other comprehensive loss when the underlying transaction stems from a long-term equity investment or from debt designated as not due in the foreseeable future. Otherwise, we recognize transaction gains and losses arising from intercompany transactions as a component of income.

Segments - We conduct our operations through three business segments based on how we manage the business. Our Chief Executive Officer views our business, assesses performance and allocates resources using financial information generated and reported at the reportable segment level. We evaluate segment performance and allocate resources based on each reportable segment's operating income. Our reportable segments are as follows:

1.Contractor Solutions, which manufactures efficiency and performance enhancing products predominantly for residential and commercial HVAC/R and plumbing applications, which are designed primarily for the professional trades. This segment is comprised primarily of our RectorSeal and Aspen Manufacturing operating companies.

2.Specialized Reliability Solutions, which provides products for increasing the reliability, performance and lifespan of industrial assets and solving equipment maintenance challenges. This segment is comprised primarily of our Whitmore operating company and the Whitmore JV.

3.Engineered Building Solutions, which provides primarily code-driven products focused on life safety that are engineered to provide aesthetically-pleasing solutions for the construction, refurbishment and modernization of commercial, institutional, and multi-family residential buildings. This segment is comprised of our Balco, Greco and Smoke Guard operating companies.

Intersegment sales and transfers are recorded at cost plus a profit margin, with the revenues and related margin on such sales eliminated in consolidation. We do not allocate share-based compensation expense, interest expense or interest income to our segments. Our corporate headquarters does not constitute a separate segment. The Eliminations and Other segment information is included to reconcile segment data to the consolidated financial statements and includes assets and expenses primarily related to corporate functions and excess non-operating properties.

Accounting Developments

Pronouncements implemented

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which provides qualitative and quantitative updates to the rate reconciliation and income taxes paid disclosures, among others, in order to enhance the transparency of income tax disclosures, including consistent categories and greater disaggregation of information in the rate reconciliation and disaggregation by jurisdiction of income taxes paid. ASU 2023-09 is effective for fiscal years beginning after December 15, 2024, with early adoption permitted. Our adoption of this ASU effective April 1, 2025, applied retrospectively, did not have an impact on our consolidated balance sheets, consolidated statements of income or consolidated statement of cash flows. Refer to Note 16, income tax for the Company's disclosures.

Pronouncements not yet implemented

In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income (Topic 220): Expense Disaggregation Disclosures. Additionally, in January 2025, the FASB issued ASU 2025-01 to clarify the effective date of ASU 2024-03. This ASU provides guidance to expand disclosures related to the disaggregation of income statement expenses. Also, this ASU requires, in the notes to the financial statements, disclosure of specified information about certain costs and expenses which includes purchases of inventory, employee compensation, depreciation, and intangible asset amortization included in each relevant expense caption. ASU 2025-01 is effective for fiscal years beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027, on a retrospective or prospective basis, with early adoption permitted. This ASU will be effective for our Form 10-K for fiscal 2028 and our Form 10-Q for the first quarter of 2029. We are currently evaluating the impact this ASU may have on our financial statement disclosures.

In November 2025, the FASB issued ASU 2025-09, Derivatives and Hedging (Topic 815): Hedge Accounting Improvements, which includes amendments to more closely align hedge accounting with the economics of an entity’s risk management activities. ASU 2025-09 is effective for fiscal years beginning after December 15, 2026 with early adoption permitted and should be applied prospectively. The amendments will be effective for our Form 10-K for fiscal 2028 and our

Form 10-Q for the first quarter of 2028. We are currently evaluating the impact this ASU may have on our financial statement disclosures.

In December 2025, the FASB issued ASU 2025-11 to amend the guidance in Interim Reporting (Topic 270): Narrow- Scope Improvements. The update provides clarifications intended to improve the consistency and usability of interim disclosure requirements, including a comprehensive listing of required interim disclosures and a new disclosure principle for reporting material events occurring after the most recent annual period. The amendments do not change the underlying objectives of interim reporting but are designed to enhance clarity in application. The guidance is effective for fiscal years beginning after December 15, 2027, including interim periods within those fiscal years. This ASU will be effective for our Form 10-K for fiscal 2029 and our Form 10-Q for the first quarter of 2029. We are currently evaluating the impact this ASU may have on our financial statement disclosures.

In December 2025, the FASB issued ASU 2025-12 Codification Improvements to address suggestions received from stakeholders on the Accounting Standards Codification and to make other incremental improvements to U.S. GAAP. The update represents changes to the Codification that (1) clarify, (2) correct errors, or (3) make minor improvements. The amendments make the Codification easier to understand and apply. The guidance is effective for fiscal years beginning after December 15, 2026, including interim periods within those fiscal years. This ASU will be effective for our Form 10-K for fiscal 2028 and our Form 10-Q for the first quarter of 2028. We do not expect the adoption to have a material impact on our financial statement disclosures.

Insider Trading Policies and Procedures	12 Months Ended
Insider Trading Policies and Procedures	Mar. 31, 2026
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

BUSINESS HELD FOR SALE AND EXIT ACTIVITIES (Tables)

12 Months Ended

Mar. 31, 2026

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Discontinued Operations

The carrying amounts of the assets and liabilities of the Greco US business classified as held for sale in our Consolidated Balance Sheet were as follows:


(Amounts in thousands)	March 31, 2026
Accounts receivable, net	$	3,733
Inventories, net	2,251
Prepaid expenses and other current assets	373
Right-of-use lease assets	2,385
Total assets held for sale	$	8,742

Accounts payable	$	566
Accrued and other current liabilities	1,869
Operating lease liabilities	2,043
Total liabilities held for sale	$	4,478

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

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EARNINGS PER SHARE (Tables)

12 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Schedule of Reconciliation of Earnings Per Share

The following table sets forth the reconciliation of the numerator and the denominator of basic and diluted earnings per share for the years ended March 31, 2026, 2025 and 2024:


	Year Ended March 31,
	2026		2025		2024
Net income	$	112,847	$	137,484	$	102,539

Income attributable to redeemable noncontrolling interest	(802)		(832)		(891)
Net income attributable to CSW	$	112,045	$	136,652	$	101,648
Weighted average shares:
Common stock	16,570		16,148		15,427
Participating securities	83		94		106
Denominator for basic earnings per common share	16,653		16,242		15,533
Potentially dilutive securities	59		72		48
Denominator for diluted earnings per common share	16,712		16,314		15,581

Net income per share attributable to CSW:
Basic	$	6.73	$	8.41	$	6.54
Diluted	$	6.70	$	8.38	$	6.52

REVENUE RECOGNITION

12 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

REVENUE RECOGNITION

We conduct our operations in three reportable segments: Contractor Solutions, Specialized Reliability Solutions and Engineered Building Solutions. With the adoption of ASC Topic 606, we have concluded that the disaggregation of revenues that would be most useful in understanding the nature, timing and extent of revenue recognition is the breakout of build-to-order and book-and-ship, as defined below:

Build-to-order products are architecturally-specified building products generally sold into the construction industry. Revenue generated from sales of products under build-to-order transactions are currently reflected in the results of our Engineered Building Solutions segment. Occasionally, our built-to-order business lines enter into arrangements for the delivery of a customer-specified product and the provision of installation services. These orders are generally negotiated as a package and are commonly subject to retainage by the customer, which means the final 10% of the transaction price, when applicable, is not collectible until the overall construction project into which our products are incorporated is complete. The lead times for transfer to the customer can be up to 12 weeks. Revenue for goods is recognized at a point in time, but installation services are recognized over time as those services are performed, using an appropriate input measure, i.e. costs and labor hours incurred in relation to total estimates. Installation services represented approximately 2% of total consolidated revenue for the year ended March 31, 2026.

Book-and-ship products are sold across all of our end markets. Revenue generated from sales of products under book-and-ship transactions have historically been presented in the Contractor Solutions, Specialized Reliability Solutions and Engineered Building Solutions segments. These sales are typically priced on a product-by-product basis using price lists provided to our customers. The lead times for transfer to the customer is usually one week or less as these items are generally built to stock. Revenue for products sold under these arrangements is recognized at a point in time.

Disaggregation of revenues reconciled to our reportable segments is as follows (in thousands):


	Year Ended March 31, 2026
	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Total
Build-to-order	$	—	$	—	$	105,611	$	105,611
Book-and-ship	802,703		159,954		14,281		976,938
Net revenues	$	802,703	$	159,954	$	119,892	$	1,082,549


	Year Ended March 31, 2025
	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Total
Build-to-order	$	—	$	—	$	106,562	$	106,562
Book-and-ship	609,706		147,476		14,557		771,739
Net revenues	$	609,706	$	147,476	$	121,119	$	878,301


	Year Ended March 31, 2024
	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Total
Build-to-order	$	—	$	—	$	99,760	$	99,760
Book-and-ship	528,641		149,458		14,981		693,080
Net revenues	$	528,641	$	149,458	$	114,741	$	792,840

As of March 31, 2026, 2025 and 2024 accounts receivable balances, net of an allowance for credit losses, were $210.3 million, $155.7 million and $142.7 million, respectively. The following table summarizes the activity in the allowance for credit losses (in thousands):


	March 31, 2026		March 31, 2025
Balance at beginning of the year:	$	1,137	$	908
Reserve	2,279		1,408
Write offs, net of recoveries	(1,101)		(1,179)

Ending balance	$	2,314	$	1,137

Contract Balances

We receive payment from customers based on a contractual billing schedule and specific performance requirements as established in our contracts. We record billings as accounts receivable when an unconditional right to consideration exists. Contract liability represents our contractual billings in advance of revenue recognized for a contract and is included in accrued and other current liabilities in our consolidated balance sheets were as follows (in thousands):


	March 31, 2026		March 31, 2025
Balance at beginning of the year	$	932	$	548
Revenue recognized	(818)		(436)

New contracts and revenue added to existing contracts	1,430		820
Ending balance	$	1,544	$	932

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Net income	$ 112,847	$ 137,484	$ 102,539
Income attributable to redeemable noncontrolling interest	(802)	(832)	(891)
Net income attributable to CSW	$ 112,045	$ 136,652	$ 101,648
Weighted average shares:
Common stock (in shares)	16,570	16,148	15,427
Participating securities (in shares)	83	94	106
Denominator for basic earnings per common share (in shares)	16,653	16,242	15,533
Potentially dilutive securities (in shares)	59	72	48
Denominator for diluted earnings per common share (in shares)	16,712	16,314	15,581
Net income per share attributable to CSW:
Basic (in USD per share)	$ 6.73	$ 8.41	$ 6.54
Diluted (in USD per share)	$ 6.70	$ 8.38	$ 6.52

GOODWILL AND INTANGIBLE ASSETS - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
PF WaterWorks acquisition
Impairment	$ (7,500)	$ (7,493)	$ 0	$ 0
Impairment expenses		15,634	0	1,600
Tangible asset impairment charges	$ 1,500
Amortization of intangible assets		47,300	25,900	22,600
Cost, amortization		800	700	700
Trade Names and Trademarks
PF WaterWorks acquisition
Impairment loss		$ 15,600	$ 0	$ 1,500
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]		Asset Impairment Charges

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

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+ Details

SHARE-BASED COMPENSATION - Schedule of Share-Based Compensation (Details) - Restricted stock awards activities - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 14,930	$ 13,587	$ 11,537
Related income tax benefit	(3,733)	(3,397)	(2,885)
Net share-based compensation expense	$ 11,197	$ 10,190	$ 8,652

- Definition

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+ Details

RETIREMENT PLANS

12 Months Ended

Mar. 31, 2026

Retirement Benefits [Abstract]

RETIREMENT PLANS

We maintain a frozen unfunded retirement restoration plan (the “Restoration Plan”) that is a non-qualified plan providing for the payment to participating employees, upon retirement, of the difference between the maximum annual payment permissible under the Qualified Plan pursuant to federal limitations and the amount that would otherwise have been payable under the Qualified Plan. The Restoration Plan was closed to new participants on January 1, 2015 and was amended to freeze benefit accruals and to modify certain ancillary benefits effective as of September 30, 2015. As of March 31, 2026 and 2025, the Restoration Plan reported liabilities of $1.1 million and $1.2 million, respectively.

The following are assumptions related to the Restoration Plan:


	March 31,
	2026		2025		2024
Assumptions used to determine benefit obligations:
Discount rate	5.7	%	5.5	%	5.5	%

Assumptions used to determine net pension expense:
Discount rate	5.5	%	5.5	%	5.4	%

The summary of the changes in the Restoration Plan's pension obligations:


	March 31,
	2026		2025
Benefit obligation at beginning of year	$	1,186	$	1,217
Interest cost	63		64
Actuarial loss	4		11
Benefits paid	(106)		(106)
Benefit obligation at end of year	$	1,147	$	1,186
Accumulated benefit obligation	$	1,147	$	1,186

The following summarizes amounts recognized in the balance sheets for the Restoration Plan:


	March 31,
	2026		2025

Current liabilities	$	(106)	$	(103)
Noncurrent liabilities	(1,040)		(1,083)
Unfunded status	$	(1,146)	$	(1,186)

Net pension expense for the Restoration Plan was:


	Year Ended March 31,
	2026		2025		2024

Interest cost on projected benefit obligation	$	63	$	64	$	65

Net loss amortization	9		2		2




Net pension expense	$	72	$	66	$	67

No estimated prior service costs or net loss for the Restoration Plan will be amortized from accumulated other comprehensive loss into pension expense in the year ended March 31, 2026.

The following table summarizes the expected cash benefit payments for the Restoration Plan for fiscal years ending March 31 (in millions):


2027	$	0.1
2028	0.1
2029	0.1
2030	0.1
2031	0.1
Thereafter	0.5

Defined Contribution Plan

Effective October 1, 2015, we began to sponsor a defined contribution plan covering substantially all of our U.S. employees. Employees may contribute to this plan, and these contributions are matched 100% by us up to 6.0% of eligible earnings. We also contribute an additional percentage of eligible earnings to employees regardless of their level of participation in the plan, which is discretionary and varies based on profitability. For the year ended March 31, 2026, we made contributions of $5.0 million during the year and additional contributions of $2.9 million in May 2026. For the year ended March 31, 2025, total $7.0 million contributions were made during the year.

Employee Stock Ownership Plan

We sponsor a qualified, non-leveraged Employee Stock Ownership Plan (“ESOP”) in which domestic employees are eligible to participate following the completion of one year of service. The ESOP provides annual discretionary contributions of up to the maximum amount that is deductible under the Internal Revenue Code. Contributions to the ESOP are invested in our common stock. A participant’s interest in contributions to the ESOP fully vests after three years of credited service or upon retirement, permanent disability (each, as defined in the plan document) or death.

We recorded total contributions to the ESOP of $4.9 million, $4.2 million and $4.8 million during the years ended March 31, 2026, 2025 and 2024, respectively, based on performance in the prior year. During the year ended March 31, 2026, $5.0 million was recorded to expense based on performance in the year ended March 31, 2026 and is expected to be contributed to the ESOP during the year ending March 31, 2027.

The ESOP held 352,741 and 432,912 shares of CSW common stock as of March 31, 2026 and 2025, respectively.

- Definition

The entire disclosure for retirement benefits.

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+ Details

FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Acquisition-related contingent consideration liabilities	$ 16,700	$ 24,400
Significant Other Observable Inputs (Level II): \| Carrying Value \| Interest rate swap
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Interest rate swap	1,208	0
Significant Other Observable Inputs (Level II): \| Fair Value \| Interest rate swap
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Interest rate swap	1,208	0
Unobservable Inputs (Level III): \| Carrying Value
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Acquisition-related contingent consideration liabilities	16,655	24,385
Unobservable Inputs (Level III): \| Fair Value
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Acquisition-related contingent consideration liabilities	$ 16,655	$ 24,385

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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+ Details

SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

Schedule of Share-Based Compensation Expense

We recorded share-based compensation expense, net of estimated forfeitures, for restricted stock as follows for the years ended March 31, 2026, 2025 and 2024 (in thousands):


	Year Ended March 31,
	2026		2025		2024
Share-based compensation expense	$	14,930	$	13,587	$	11,537
Related income tax benefit (a)	(3,733)		(3,397)		(2,885)
Net share-based compensation expense	$	11,197	$	10,190	$	8,652

(a) Income tax benefit is estimated using the statutory rate

Schedule of Restricted Stock Activity

Restricted stock activity was as follows:


	Year Ended March 31, 2026
	Number of Shares	Weighted Average Grant Date Fair Value
Outstanding at April 1, 2025	194,149	$	203.62
Granted	74,454	316.53
Vested	(90,813)	185.80
Canceled	(4,315)	254.43
Outstanding at March 31, 2026	173,475	$	236.56

GOODWILL AND INTANGIBLE ASSETS - Schedule of Estimated Future Amortization of Finite-Lived Intangible Assets (Details) $ in Thousands	Mar. 31, 2026 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2027	$ 60,718
2028	60,320
2029	60,188
2030	59,867
2031	59,754
Thereafter	465,733
Total	$ 766,580

INCOME TAXES (Tables)

12 Months Ended

Mar. 31, 2026

Income Tax Disclosure [Abstract]

Schedule of Income Before Income Taxes

Income before income taxes was comprised of the following (in thousands):


	Year Ended March 31,
	2026		2025		2024
U.S. Federal	$	145,556	$	163,935	$	127,647
Foreign	(3)		16,182		12,833
Income before income taxes	$	145,553	$	180,117	$	140,480

Schedule of Summarized By Jurisdiction, Income Taxes Paid, Net of Refunds

The following table summarized by jurisdiction our income taxes paid, net of refunds (in thousands):


	Year Ended March 31,
	2026		2025		2024
Federal	$	31,400	$	38,263	$	30,916
State	10,544		9,677		6,448
Foreign	4,472		2,926		1,931
	$	46,416	$	50,866	$	39,295

Schedule of Income Tax Expense

Income tax expense consists of the following (in thousands):


	Current		Deferred		Total
March 31, 2026
U.S. Federal	$	24,892	$	(320)	$	24,572
State and local	9,022		(2,004)		7,018
Foreign	3,546		(2,430)		1,116
Provision for income taxes	$	37,460	$	(4,754)	$	32,706
March 31, 2025
U.S. Federal	$	35,448	$	(4,888)	$	30,560
State and local	9,371		(1,374)		7,997
Foreign	4,378		(302)		4,076
Provision for income taxes	$	49,197	$	(6,564)	$	42,633
March 31, 2024
U.S. Federal	$	28,832	$	(2,560)	$	26,272
State and local	8,057		(10)		8,047
Foreign	3,444		178		3,622
Provision for income taxes	$	40,333	$	(2,392)	$	37,941

Schedule of Income Tax Expense Differed from Amounts Computed by Applying U.S. Federal Statutory Income Tax Rate to Income Before Income Taxes

Income tax expense differed from the amounts computed by applying the U.S. federal statutory income tax rate of 21.0% to income before income taxes as a result of the following (in thousands):


	Year Ended March 31,
	2026				2025				2024
	Amount		Percent		Amount		Percent		Amount		Percent
Income before income tax	$	145,553			$	180,117			$	140,480
U.S. federal statutory tax rate	30,566		21.0	%	37,825		21.0	%	29,501		21.0	%
United States
State and local income taxes (1), (2), (3)	5,544		3.8	%	6,325		3.5	%	6,358		4.5	%
Effect of cross-border tax laws	(758)		(0.5)	%	(908)		(0.5)	%	(345)		(0.2)	%
Tax credits	(389)		(0.3)	%	(274)		(0.2)	%	(21)		—	%
Changes in valuation allowances	—		—	%	(216)		(0.1)	%	(132)		(0.1)	%
Nontaxable or nondeductible items
Executive compensation limitation	1,731		1.2	%	2,062		1.1	%	2,070		1.5	%
Indemnification asset	269		0.2	%	124		0.1	%	1,789		1.3	%
Other	289		0.2	%	(1,453)		(0.8)	%	(541)		(0.4)	%
Other adjustments	(750)		(0.5)	%	286		0.2	%	(1,856)		(1.3)	%
Foreign tax effects
Canada	1,722		1.2	%	607		0.3	%	1,119		0.8	%
Other foreign jurisdictions	(289)		(0.2)	%	543		0.3	%	(60)		—	%
Changes in unrecognized tax benefits ("UTP")	(5,229)		(3.6)	%	(2,288)		(1.3)	%	59		—	%
Income tax expense	$	32,706	22.5	%	$	42,633	23.7	%	$	37,941	27.0	%

(1) State taxes in South Carolina, California, Pennsylvania, and Virginia are attributable to greater than 50% of the net income tax provision (benefit) for the year ended March 31, 2026.

(2) State taxes in California, Texas, and New Jersey are attributable to greater than 50% of the net income tax provision (benefit) for the year ended March 31, 2025.

(3) State taxes in California, Texas and Maryland are attributable to greater than 50% of the net income tax provision (benefit) for the year ended March 31, 2024.

Schedule of Tax Effects of Temporary Differences That Give Rise to Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at March 31, 2026 and 2025 are presented below (in thousands):


	March 31,
	2026		2025
Deferred tax assets:
Operating lease liabilities	$	17,603	$	16,461
Accrued compensation	7,390		6,197

Pension and other employee benefits	1,563		554
Inventory reserves	8,103		4,938

Accrued expenses	4,530		823
Credits and carryforwards	1,222		441
Capitalized R&D	—		1,859
Transaction Costs	2,563		1,863
Other, net	2,186		1,067
Deferred tax assets	45,160		34,203
Valuation allowance	(459)		(444)
Deferred tax assets, net of valuation allowance	44,701		33,759

Deferred tax liabilities:
Goodwill and intangible assets	(110,463)		(60,979)
Property, plant and equipment	(9,687)		(7,462)
Operating lease right-of-use assets	(15,931)		(14,681)
Repatriation reserve	(2,345)		(2,079)
Other, net	(3,600)		(896)
Deferred tax liabilities	(142,026)		(86,097)
Net deferred tax liabilities	$	(97,325)	$	(52,338)

Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest and penalties, is as follows (in thousands):


	March 31,
	2026		2025
Balance at beginning of year	$	8,396	$	10,877


Decreases related to lapses of statute of limitations	(3,913)		(2,481)

Balance at end of year	$	4,483	$	8,396

DETAILS OF CERTAIN CONSOLIDATED BALANCE SHEET CAPTIONS

12 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

DETAILS OF CERTAIN CONSOLIDATED BALANCE SHEET CAPTIONS

Accounts receivable, net consists of the following (in thousands):


	March 31,
	2026		2025
Accounts receivable trade	$	209,267	$	151,646
Other receivables	3,311		5,142
	212,578		156,788
Less: Allowance for credit losses	(2,314)		(1,137)
Accounts receivable, net	$	210,264	$	155,651

Prepaid expenses and other current assets consists of the following (in thousands):


	March 31,
	2026		2025
Prepaid expenses	$	14,125	$	11,602
Income taxes receivable	7,731		2,090
Other current assets	3,618		1,458
Current derivative asset	761		—
Short-term tax indemnification assets	320		1,339
	$	26,555	$	16,489

Property, plant and equipment, net, consist of the following (in thousands):


	March 31,
	2026		2025
Land and improvements	$	3,112	$	3,112
Buildings and improvements	57,782		56,982
Plant, office and laboratory equipment	165,378		136,244
Construction in progress	6,451		10,296
Other	365		—
	233,088		206,634
Less: Accumulated depreciation	(125,552)		(113,219)
Property, plant and equipment, net	$	107,536	$	93,415

Depreciation of property, plant and equipment was $15.9 million, $14.2 million and $13.9 million for the years ended March 31, 2026, 2025 and 2024, respectively. Of these amounts, cost of revenues includes $11.7 million, $9.3 million and $9.1 million, respectively. During the fiscal quarter ended March 31, 2026, as discussed in Note 7, we recorded $1.5 million of impairment expense relating to long-lived assets held by Greco US and Greco Canada businesses, included in impairment expense in our Consolidated Statement of Income for our Engineered Building Solutions segment.

Other assets consist of the following (in thousands):


	March 31,
	2026		2025
Right-of-use lease assets	$	68,617	$	62,061
Long-term investments	7,300		2,500
Deferred financing fees	2,822		829
Rent receivable	1,862		1,978
Long-term tax indemnification assets	1,210		502
Deferred income taxes	901		350
Long-term derivative asset	447		—
Property held for investment	418		418
Other	3,822		2,149
Other assets	$	87,399	$	70,787

Accrued and other current liabilities consist of the following (in thousands):


	March 31,
	2026		2025
Compensation and related benefits	$	39,261	$	31,381
Rebates and marketing agreements	26,900		19,650

Operating lease liabilities	13,622		11,244
Short-term contingent consideration liability	11,580		12,150
Non-income taxes	3,941		2,409
Income taxes payable	2,336		3,075
Billings in excess of costs	1,544		932
Other accrued expenses	16,871		11,594
Accrued and other current liabilities	$	116,055	$	92,435

Other long-term liabilities consists of the following (in thousands):


	March 31,
	2026		2025
Operating lease liabilities	$	61,862	$	58,120
Deferred income taxes	98,226		52,688
Tax Reserve	9,295		14,728

Long-term contingent consideration liability	5,175		12,235
Other	4,931		576
Other long-term liabilities	$	179,489	$	138,347

LEASES (Tables)

12 Months Ended

Mar. 31, 2026

Leases [Abstract]

Schedule of Components of Operating Lease Expense, Operating Lease Assets and Liabilities, Supplemental Cash Flow, and Other Information


(in thousands)	March 31, 2026		March 31, 2025
Components of Operating Lease Expenses
Operating lease expense	$	17,164	$	13,048
Short-term lease expense	438		953
Total operating lease expense (a)	$	17,602	$	14,001
(a) Included in cost of revenues and selling, general and administrative expense

(in thousands)	March 31, 2026		March 31, 2025
Operating Lease Assets and Liabilities
Right-of-use lease assets, net (a)	$	68,617	$	62,061
Assets of business held for sale	2,385		$	—

Short-term lease liabilities (b)	$	13,622	$	11,244
Long-term lease liabilities (b)	61,862		58,120
Liabilities of business held for sale	2,398		—
Total operating lease liabilities	$	77,882	$	69,364
(a) Included in other assets
(b) Included in accrued and other current liabilities and other long-term liabilities, as applicable


	Year Ended March 31,
(in thousands)	2026			2025
Supplemental Cash Flow
Cash paid for amounts included in the measurement of operating lease liabilities	$	17,133		$	13,132
Right-of-use assets obtained in exchange for new operating lease obligations	16,371			30,018

Other Information for Operating Leases
Weighted average remaining lease term (in years)	6.3			7.0
Weighted average discount rate (percent)	5.8		%	5.6		%

Schedule of Maturities of Operating Lease Liabilities


Maturities of operating lease liabilities were as follows:
Year Ending March 31,
2027	$	17,840
2028	16,450
2029	14,933
2030	12,545
2031	9,042
Thereafter	23,265
Total lease liabilities	$	94,075
Less: Imputed interest	(16,193)
Present value of lease liabilities	$	77,882

CONSOLIDATION OF VARIABLE INTEREST ENTITIES AND REDEEMABLE NONCONTROLLING INTEREST - Schedule of Variable Interest Entities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Variable Interest Entity [Line Items]
Cash	$ 33,799	$ 225,845
Inventories, net	309,707	194,876
Prepaid expenses and other current assets	26,555	16,489
Property, plant and equipment, net	107,536	93,415
Total assets	2,316,684	1,379,065	$ 1,043,326
Other long-term liabilities	179,489	138,347
Total liabilities	1,247,286	286,632
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash	4,628	9,591
Accounts receivable, net	9,417	8,407
Inventories, net	4,997	4,823
Prepaid expenses and other current assets	2,033	254
Property, plant and equipment, net	14,228	13,452
Intangible assets, net	4,049	4,859
Other assets	725	598
Total assets	40,077	41,983
Accounts payable	7,250	7,755
Accrued and other current liabilities	2,247	1,605
Other long-term liabilities	786	413
Total liabilities	$ 10,284	$ 9,774

ORGANIZATION AND OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Apr. 01, 2021	Mar. 31, 2026 USD ($)	Mar. 31, 2026 USD ($) segment brand	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of business segments \| segment			3
Highly respected industrial brands (more than) \| brand			100
Allowance for expected credit losses for short-term receivables		$ (2,314)	$ (2,314)	$ (1,137)
Impairment		(7,500)	$ (7,493)	0	$ 0
Goodwill Impairment Loss, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag			impairment loss
Impairment expenses			$ 15,634	0	1,600
Acquisition-related contingent consideration liabilities		16,700	16,700	24,400
Research and development costs			5,800	5,300	5,900
Advertising cost			6,700	4,700	4,500
Variable Interest Entity, Primary Beneficiary
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest sold (in percent)	50.00%
Variable Interest Entity, Primary Beneficiary \| Shell \| Whitmore Manufacturing, LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest sold (in percent)	50.00%
Variable Interest Entity, Primary Beneficiary \| Shell \| Affiliated Entity \| Whitmore Manufacturing, LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest sold (in percent)	50.00%
Unobservable Inputs (Level III): \| Carrying Value
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Acquisition-related contingent consideration liabilities		16,655	16,655	24,385
Trade Names and Trademarks
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impairment loss			15,600	0	$ 1,500
Trademarks And Customer Lists
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impairment expenses		6,600
U.S.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deposits in banks		13,300	13,300	214,800
Non-U.S.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deposits in banks		$ 20,500	$ 20,500	$ 11,000

RETIREMENT PLANS - Defined Contribution Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Retirement Benefits [Abstract]
Employer matching contribution, percent of match	100.00%
Employer matching contribution, percent of employees' gross pay	6.00%
Contributions to defined contribution plan	$ 5.0	$ 7.0

ACQUISITIONS - Schedule of Unaudited Proforma Financial Information (Details) - MARS Parts and Aspen Manufacturing - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Business Combination [Line Items]
Revenue, net	$ 1,232,737	$ 1,207,036
Net income attributable to CSW	$ 124,394	$ 115,238
Net income per share attributable to CSW
Basic (in dollars per share)	$ 7.47	$ 7.10
Diluted (in dollars per share)	$ 7.44	$ 7.06

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479303/805-10-55-47

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (f)(1)
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-URI https://asc.fasb.org/1943274/2147479581/805-30-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

REVENUE RECOGNITION (Tables)

12 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

Disaggregation of revenues reconciled to our reportable segments is as follows (in thousands):


	Year Ended March 31, 2026
	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Total
Build-to-order	$	—	$	—	$	105,611	$	105,611
Book-and-ship	802,703		159,954		14,281		976,938
Net revenues	$	802,703	$	159,954	$	119,892	$	1,082,549


	Year Ended March 31, 2025
	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Total
Build-to-order	$	—	$	—	$	106,562	$	106,562
Book-and-ship	609,706		147,476		14,557		771,739
Net revenues	$	609,706	$	147,476	$	121,119	$	878,301


	Year Ended March 31, 2024
	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Total
Build-to-order	$	—	$	—	$	99,760	$	99,760
Book-and-ship	528,641		149,458		14,981		693,080
Net revenues	$	528,641	$	149,458	$	114,741	$	792,840

Schedule of Accounts Receivable, Allowance for Credit Loss

The following table summarizes the activity in the allowance for credit losses (in thousands):


	March 31, 2026		March 31, 2025
Balance at beginning of the year:	$	1,137	$	908
Reserve	2,279		1,408
Write offs, net of recoveries	(1,101)		(1,179)

Ending balance	$	2,314	$	1,137

Schedule of Contract Liabilities

Contract liability represents our contractual billings in advance of revenue recognized for a contract and is included in accrued and other current liabilities in our consolidated balance sheets were as follows (in thousands):


	March 31, 2026		March 31, 2025
Balance at beginning of the year	$	932	$	548
Revenue recognized	(818)		(436)

New contracts and revenue added to existing contracts	1,430		820
Ending balance	$	1,544	$	932

BUSINESS HELD FOR SALE AND EXIT ACTIVITIES

12 Months Ended

Mar. 31, 2026

Discontinued Operations and Disposal Groups [Abstract]

BUSINESS HELD FOR SALE AND EXIT ACTIVITIES

As discussed in Note 4, during the quarter ended March 31, 2026, we completed our annual quantitative impairment assessment for the Greco reporting unit, including both Greco US and Greco Canada businesses, and determined that the fair value of the Greco reporting unit was below its carrying value and accordingly recorded a non-cash impairment of $15.6 million, including $7.5 million for goodwill, $6.6 million for intangible assets and $1.5 million for long-lived assets, included in the impairment expenses line in our Consolidated Statement of Income under the Engineered Building Solutions segment.

During the quarter ended March 31, 2026, the Company committed to a plan to pursue a sale of the Greco US business, which is available for immediate sale in its present condition, and the Company has initiated an active program to locate a buyer. Management believes a sale is probable within twelve months of the balance sheet date at a price that is reasonable in relation to the current estimated fair value. Accordingly, the Greco US asset group has been classified as held for sale as of March 31, 2026 in accordance with ASC 360-10-45-9 and is carried at the lower of carrying amount or estimated fair value less costs to sell. Depreciation of the related assets ceased upon classification as held for sale. The Company has determined that the disposal does not represent a strategic shift that has, or will have, a major effect on the Company's operations or financial results. Accordingly, the Greco US business has not been classified as a discontinued operation under ASC 205-20, and the results of operations attributable to these assets continue to be reflected within the Engineered Building Solutions segment for all periods presented.

The revenue and pre-tax income (loss), excluding the impairment expenses, attributable to the Greco US business included in continuing operations were $15.7 million and $(1.6) million for the year ended March 31, 2026; $18.6 million and $0.7 million for the year ended March 31, 2025 and $15.9 million and $(0.3) million for the year ended March 31, 2024.

The carrying amounts of the assets and liabilities of the Greco US business classified as held for sale in our Consolidated Balance Sheet were as follows:


(Amounts in thousands)	March 31, 2026
Accounts receivable, net	$	3,733
Inventories, net	2,251
Prepaid expenses and other current assets	373
Right-of-use lease assets	2,385
Total assets held for sale	$	8,742

Accounts payable	$	566
Accrued and other current liabilities	1,869
Operating lease liabilities	2,043
Total liabilities held for sale	$	4,478

During the quarter ended March 31, 2026, in conjunction with the plan to sell the Greco US business as discussed above, the Company committed to the strategic exit of the Greco Canada business (the "Greco Canada Exit"). The costs for the Greco Canada Exit primarily included employee severance and termination costs, as well as additional reserves related to accounts receivable and inventory. We recognized $2.1 million expenses, as a result of this initiative during the quarter ended March 31, 2026, which are included in the selling, general, and administrative expenses line ($0.7 million) and cost of revenues line ($1.4 million) in our Consolidated Statement of Income. As of March 31, 2026, we expect to incur approximately $1.5 million to $2.0 million of additional expenses related to the Greco Canada Exit.

The revenue and pre-tax income (loss), excluding the impairment and Greco Canada Exit related expenses, attributable to the Greco Canada business included in continuing operations were $17.7 million and $(0.7) million for the year ended March 31, 2026; $20.9 million and $2.0 million for the year ended March 31, 2025; $17.9 million and $1.8 million for the year ended March 31, 2024.

SHAREHOLDERS' EQUITY - Schedule of Stockholders Equity (Details) - shares	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of the year (in shares)	1,027,000
Ending balance (in shares)	1,544,000	1,027,000
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of the year (in shares)	17,809,590	16,465,776
Reissuance of treasury shares (in shares)	0	0
Share repurchases (in shares)	0	0
Ending balance (in shares)	17,893,059	17,809,590
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of the year (in shares)	1,026,941	952,394
Reissuance of treasury shares (in shares)	(15,539)	(17,186)
Share repurchases (in shares)	503,076	59,202
Ending balance (in shares)	1,543,791	1,026,941
Vesting of performance shares and restricted stock units \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of performance shares and restricted stock units (in shares)	59,637	58,640
Vesting of performance shares and restricted stock units \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of performance shares and restricted stock units (in shares)	22,416	21,745
Restricted stock awards activities \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock awards activities (in shares)	23,832	20,174
Restricted stock awards activities \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock awards activities (in shares)	6,897	10,786
Equity issuance \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity issuance (in shares)	0	1,265,000
Equity issuance \| Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity issuance (in shares)	0	0

Cover Page - USD ($) $ in Millions	12 Months Ended
Cover Page - USD ($) $ in Millions	Mar. 31, 2026	May 20, 2026	Sep. 30, 2025
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Mar. 31, 2026
Current Fiscal Year End Date	--03-31
Document Transition Report	false
Entity File Number	001-37454
Entity Registrant Name	CSW INDUSTRIALS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-2266942
Entity Address, Address Line One	5420 Lyndon B. Johnson Freeway, Suite 500
Entity Address, City or Town	Dallas
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75240
City Area Code	214
Local Phone Number	884-3777
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	CSW
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 4,012.3
Entity Common Stock, Shares Outstanding		16,319,483
Documents Incorporated by Reference	Certain information contained in the definitive proxy statement for the registrant’s Annual Meeting of Stockholders is incorporated by reference into Part III hereof.
Amendment Flag	false
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	FY
Entity Central Index Key	0001624794

RETIREMENT PLANS - Schedule of Net Pension (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Retirement Benefits [Abstract]
Interest cost on projected benefit obligation	$ 63	$ 64	$ 65
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expense, net	Other expense, net	Other expense, net
Net loss amortization	$ 9	$ 2	$ 2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expense, net	Other expense, net	Other expense, net
Net pension expense	$ 72	$ 66	$ 67

RETIREMENT PLANS (Tables)

12 Months Ended

Mar. 31, 2026

Retirement Benefits [Abstract]

Summary of Assumptions Related to Retirement Plan

The following are assumptions related to the Restoration Plan:


	March 31,
	2026		2025		2024
Assumptions used to determine benefit obligations:
Discount rate	5.7	%	5.5	%	5.5	%

Assumptions used to determine net pension expense:
Discount rate	5.5	%	5.5	%	5.4	%

Schedule of Changes in Projected Benefit Obligations

The summary of the changes in the Restoration Plan's pension obligations:


	March 31,
	2026		2025
Benefit obligation at beginning of year	$	1,186	$	1,217
Interest cost	63		64
Actuarial loss	4		11
Benefits paid	(106)		(106)
Benefit obligation at end of year	$	1,147	$	1,186
Accumulated benefit obligation	$	1,147	$	1,186

Summary of Amounts Recognized in Balance Sheet

The following summarizes amounts recognized in the balance sheets for the Restoration Plan:


	March 31,
	2026		2025

Current liabilities	$	(106)	$	(103)
Noncurrent liabilities	(1,040)		(1,083)
Unfunded status	$	(1,146)	$	(1,186)

Schedule of Pension Plan

Net pension expense for the Restoration Plan was:


	Year Ended March 31,
	2026		2025		2024

Interest cost on projected benefit obligation	$	63	$	64	$	65

Net loss amortization	9		2		2




Net pension expense	$	72	$	66	$	67

Summary of Expected Cash Benefit Payments

The following table summarizes the expected cash benefit payments for the Restoration Plan for fiscal years ending March 31 (in millions):


2027	$	0.1
2028	0.1
2029	0.1
2030	0.1
2031	0.1
Thereafter	0.5

LEASES

12 Months Ended

Mar. 31, 2026

Leases [Abstract]

LEASES

We have operating leases for manufacturing facilities, offices, warehouses, vehicles and certain equipment. Our leases have remaining lease terms of 1 year to 22 years, some of which include escalation clauses and/or options to extend or terminate the leases. Our financing lease arrangements are immaterial.


(in thousands)	March 31, 2026		March 31, 2025
Components of Operating Lease Expenses
Operating lease expense	$	17,164	$	13,048
Short-term lease expense	438		953
Total operating lease expense (a)	$	17,602	$	14,001
(a) Included in cost of revenues and selling, general and administrative expense

(in thousands)	March 31, 2026		March 31, 2025
Operating Lease Assets and Liabilities
Right-of-use lease assets, net (a)	$	68,617	$	62,061
Assets of business held for sale	2,385		$	—

Short-term lease liabilities (b)	$	13,622	$	11,244
Long-term lease liabilities (b)	61,862		58,120
Liabilities of business held for sale	2,398		—
Total operating lease liabilities	$	77,882	$	69,364
(a) Included in other assets
(b) Included in accrued and other current liabilities and other long-term liabilities, as applicable


	Year Ended March 31,
(in thousands)	2026			2025
Supplemental Cash Flow
Cash paid for amounts included in the measurement of operating lease liabilities	$	17,133		$	13,132
Right-of-use assets obtained in exchange for new operating lease obligations	16,371			30,018

Other Information for Operating Leases
Weighted average remaining lease term (in years)	6.3			7.0
Weighted average discount rate (percent)	5.8		%	5.6		%


Maturities of operating lease liabilities were as follows:
Year Ending March 31,
2027	$	17,840
2028	16,450
2029	14,933
2030	12,545
2031	9,042
Thereafter	23,265
Total lease liabilities	$	94,075
Less: Imputed interest	(16,193)
Present value of lease liabilities	$	77,882

LEASES - Components of Operating Lease Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Leases [Abstract]
Operating lease expense	$ 17,164	$ 13,048
Short-term lease expense	438	953
Total operating lease expense	$ 17,602	$ 14,001

OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

12 Months Ended

Mar. 31, 2026

Equity [Abstract]

Schedule of Analysis of Changes in Accumulated Other Comprehensive Income (Loss)

The following table provides an analysis of the changes in accumulated other comprehensive loss (in thousands).


	March 31,
	2026		2025
Currency translation adjustments:
Balance at beginning of period	$	(12,020)	$	(10,137)
Foreign currency translation adjustments	71		(1,883)
Balance at end of period	$	(11,949)	$	(12,020)
Interest rate swaps:
Balance at beginning of period	$	—	$	1,111
Unrealized gain, net of taxes of $(350) and $153, respectively (a)	1,316		(577)
Reclassification of losses included in interest expense, net of taxes of $96 and $142, respectively	(361)		(534)

Other comprehensive income	955		(1,111)
Balance at end of period	$	955	$	—
Defined benefit plans:
Balance at beginning of period	$	(107)	$	(100)

Amortization of net loss, net of taxes of $(1) and $2, respectively (b)	4		(7)




Other comprehensive income	4		(7)
Balance at end of period	$	(103)	$	(107)

(a) Unrealized gains are reclassified to earnings as underlying cash interest payments are made. We expect to recognize a gain of $0.6 million, net of deferred taxes, over the next twelve months related to a designated cash flow hedge based on its fair value as of March 31, 2026.

(b) Amortization of actuarial losses out of accumulated other comprehensive loss are included in the computation of net periodic pension expense. See Note 15 for additional information.

FAIR VALUE MEASUREMENTS

12 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

The carrying amounts of cash, accounts receivable, net and accounts payable approximate their fair values at March 31, 2026 and 2025 due to their short-term nature. Cash equivalents generally consist of money market funds invested with a reputable and highly diversified global bank in instruments issued or guaranteed by the U.S. Treasury. The fair value of these cash equivalents is based on quoted market price, which is a Level I input. The fair value of interest rate swaps discussed in Note 11 are determined using Level II inputs. The carrying value of our debt, included in Note 9, approximates fair value as it bears interest at floating rates.

The long-term investments with no readily determinable fair value are measured using the alternative for fair value and the investment's carrying value is reported at cost, adjusted for impairments or any observable price changes in ordinary transactions with identical or similar investments. As of March 31, 2026 and 2025, the long-term investments reported in the balance sheets were $7.3 million and $2.5 million, respectively.

The redeemable noncontrolling interest is recorded at the higher of the redemption value or carrying value each reporting period. The redemption value of the redeemable noncontrolling interest is estimated using a discounted cash flow analysis, which requires management judgment with respect to future revenue, operating margins, growth rates and discount rates and is classified as Level III under the fair value hierarchy. The redemption value of the redeemable noncontrolling interest is discussed in Note 3.

The fair value of the contingent consideration liability is determined using either a scenario-based analysis on forecasted future results or an option pricing model simulation that determines an average projected payment value across numerous iterations. The contingent consideration liability is recorded at fair value on the acquisition date and is remeasured quarterly based on the then assessed fair value. The increases or decreases in the fair value of the contingent consideration can result from changes in future operations, forecasted revenue and in assumed discount rates. The fair value measurement is based on significant inputs that are not observable in the market and is classified as Level III under the fair value hierarchy. As of March 31, 2026 and 2025, the contingent consideration liability reported in the balance sheets was $16.7 million and $24.4 million, respectively.

The following table presents the fair values of the Company's assets and liabilities measured on a recurring basis:


	March 31, 2026				March 31, 2025
(in thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Significant Other Observable Inputs (Level II):
Interest rate swap	$	1,208	$	1,208	$	—	$	—

Unobservable Inputs (Level III):
Acquisition-related contingent consideration liabilities	16,655		16,655		24,385		24,385

The following table presents the changes in the estimated fair values of the Company's contingent consideration liabilities measured using significant unobservable inputs (Level III):


(in thousands)	March 31, 2026		March 31, 2025
Balance at beginning of the year:	$	24,385	$	7,445
Cash payments	(11,730)		(160)
Change in fair value of contingent consideration liabilities	—		2,100
Additions	4,000		15,000
Ending balance	$	16,655	$	24,385

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

DETAILS OF CERTAIN CONSOLIDATED BALANCE SHEET CAPTIONS (Tables)

12 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Accounts Receivable, Net

Accounts receivable, net consists of the following (in thousands):


	March 31,
	2026		2025
Accounts receivable trade	$	209,267	$	151,646
Other receivables	3,311		5,142
	212,578		156,788
Less: Allowance for credit losses	(2,314)		(1,137)
Accounts receivable, net	$	210,264	$	155,651

Schedule of Prepaid, and Other Assets Disclosure

Prepaid expenses and other current assets consists of the following (in thousands):


	March 31,
	2026		2025
Prepaid expenses	$	14,125	$	11,602
Income taxes receivable	7,731		2,090
Other current assets	3,618		1,458
Current derivative asset	761		—
Short-term tax indemnification assets	320		1,339
	$	26,555	$	16,489

Schedule of Property, Plant and Equipment, Net

Generally, the estimated useful lives of assets are:


Land improvements	5	to	40 years
Buildings and improvements	7	to	40 years
Plant, office and lab equipment	5	to	10 years

Property, plant and equipment, net, consist of the following (in thousands):


	March 31,
	2026		2025
Land and improvements	$	3,112	$	3,112
Buildings and improvements	57,782		56,982
Plant, office and laboratory equipment	165,378		136,244
Construction in progress	6,451		10,296
Other	365		—
	233,088		206,634
Less: Accumulated depreciation	(125,552)		(113,219)
Property, plant and equipment, net	$	107,536	$	93,415

Schedule of Other Assets

Other assets consist of the following (in thousands):


	March 31,
	2026		2025
Right-of-use lease assets	$	68,617	$	62,061
Long-term investments	7,300		2,500
Deferred financing fees	2,822		829
Rent receivable	1,862		1,978
Long-term tax indemnification assets	1,210		502
Deferred income taxes	901		350
Long-term derivative asset	447		—
Property held for investment	418		418
Other	3,822		2,149
Other assets	$	87,399	$	70,787

Schedule of Accrued and Other Current Liabilities

Accrued and other current liabilities consist of the following (in thousands):


	March 31,
	2026		2025
Compensation and related benefits	$	39,261	$	31,381
Rebates and marketing agreements	26,900		19,650

Operating lease liabilities	13,622		11,244
Short-term contingent consideration liability	11,580		12,150
Non-income taxes	3,941		2,409
Income taxes payable	2,336		3,075
Billings in excess of costs	1,544		932
Other accrued expenses	16,871		11,594
Accrued and other current liabilities	$	116,055	$	92,435

Schedule of Other Long-Term Liabilities

Other long-term liabilities consists of the following (in thousands):


	March 31,
	2026		2025
Operating lease liabilities	$	61,862	$	58,120
Deferred income taxes	98,226		52,688
Tax Reserve	9,295		14,728

Long-term contingent consideration liability	5,175		12,235
Other	4,931		576
Other long-term liabilities	$	179,489	$	138,347

CONTINGENCIES (Details) $ in Millions	Mar. 31, 2026 USD ($)
Surety Bond
Loss Contingencies [Line Items]
Contingent liability	$ 1.3

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
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-URI https://asc.fasb.org/1943274/2147482861/275-10-50-9

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+ Details

INCOME TAXES - Summary of Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 8,396	$ 10,877
Decreases related to lapses of statute of limitations	(3,913)	(2,481)
Balance at end of year	$ 4,483	$ 8,396

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING (Tables)

12 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value of Interest Rate Swaps Designated as Hedging Instruments

The fair value of interest rate swaps designated as hedging instruments are summarized below (in thousands):


	March 31,
	2026		2025
Current derivative asset	$	761	$	—
Non-current derivative asset	447		—

SEGMENTS - Additional Information (Details) $ in Thousands	12 Months Ended
SEGMENTS - Additional Information (Details) $ in Thousands	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment	3
Segment Reporting Information [Line Items]
Impairment expenses	$ 15,627		$ 1,508
Inventory reserves	15,438	$ 10,751
Acquisition-related contingent consideration liabilities	16,700	24,400
Trade Names and Trademarks
Segment Reporting Information [Line Items]
Impairment loss	15,600	0	1,500
PSP Products acquisition
Segment Reporting Information [Line Items]
Acquisition-related contingent consideration liabilities		2,100
Engineered Building Solutions
Segment Reporting Information [Line Items]
Impairment expenses	13,600
Credit loss provision	500
Inventory reserves	$ 1,000
Contractor Solutions \| Trade Names and Trademarks
Segment Reporting Information [Line Items]
Impairment loss			$ 1,100
Contractor Solutions \| PSP Products acquisition
Segment Reporting Information [Line Items]
Acquisition-related contingent consideration liabilities		$ 1,600

SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)			1 Months Ended	3 Months Ended				12 Months Ended
SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)	Apr. 02, 2026	Dec. 16, 2022	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Jun. 30, 2019	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Dec. 15, 2025	Nov. 18, 2024
Equity, Class of Treasury Stock [Line Items]
Shares sold in offering (in shares)			1,265,000
Offering price per share (in USD per share)			$ 285
Consideration received			$ 347,400,000
Shares acquired as of period end								$ 21,900,000
Shares withheld for tax withholding obligation (in shares)								29,313	32,531
Payment of tax withholding								$ 8,100,000	$ 9,400,000
Dividend declared (in USD per share)				$ 0.27	$ 0.24	$ 0.21	$ 0.135
Dividends paid to shareholders								(18,021,000)	$ (14,582,000)	$ (11,805,000)
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Dividend declared (in USD per share)	$ 0.30
2022 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount		$ 100,000,000.0										$ 100,000,000.0
Repurchase program period in force		2 years
Share Repurchase Program 2024
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount								$ 100,000,000.0				$ 200,000,000.0
Shares repurchased (in shares)								0	39,157
Repurchased amount								$ 100,000,000.0	$ 11,500,000
Shares acquired as of period end (in shares)								92,290
Share Repurchase Program 2025
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount								$ 250,000,000.0			$ 250,000,000.0
Shares repurchased (in shares)								503,076	20,045
Repurchased amount								$ 127,500,000	$ 6,800,000
Shares acquired as of period end (in shares)								523,121
Shares acquired as of period end								$ 134,300,000

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING

12 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING

We enter into interest rate swap agreements to hedge exposure to floating interest rates on certain portions of our debt. All interest rate swaps are highly effective.

On February 7, 2023, we entered into an interest rate swap to hedge our exposure to variability in cash flows from interest payments on the first $100.0 million borrowing under our RCF (as defined in Note 9). This interest rate swap fixes the one-month SOFR rate at 3.85% for the first $100.0 million borrowing under our RCF, and was scheduled to expire on May 18, 2026. In September 2024, upon the payoff of the outstanding RCF balance, we terminated the interest rate swap and incurred a cash payment of $0.4 million, which was reported in our Consolidated Statements of Income in interest expense, net.

On November 4, 2025, we entered into an interest rate swap to hedge our exposure to variability in cash flows from interest payments on the first $300.0 million of borrowings under the TLA (as defined in Note 9). The interest rate swap fixed the one-month SOFR rate at 3.42% for the first $300.0 million borrowing under our TLA and is scheduled to expire on October 31, 2028. As of March 31, 2026 and 2025, we had $300.0 million and no notional amount, respectively, outstanding designated as an interest rate swap with third parties. At March 31, 2026, the maximum remaining length of the interest rate swap contract was approximately 2.6 years. The fair value of interest rate swaps designated as hedging instruments are summarized below (in thousands):


	March 31,
	2026		2025
Current derivative asset	$	761	$	—
Non-current derivative asset	447		—

The impact of changes in the fair value of interest rate swaps is included in Note 19.

Current and non-current derivative assets are reported in our consolidated balance sheets in prepaid expenses and other current assets and other assets, respectively. Current and non-current derivative liabilities are reported in our consolidated balance sheets in accrued and other current liabilities and other long-term liabilities, respectively.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

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-URI https://asc.fasb.org/1943274/2147480434/815-10-50-2

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-2

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-2

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-2

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-Name Accounting Standards Codification
-Publisher FASB
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Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
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Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5C
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-5C

+ Details

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

RETIREMENT PLANS - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May 26, 2026	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Restoration plan reported liabilities		$ (1,146)	$ (1,186)
Employer matching contribution, percent of match		100.00%
Employer matching contribution, percent of employees' gross pay		6.00%
Contributions to defined contribution plan		$ 5,000	7,000
Award requisite service period		1 year
Period of credited service after which participant's interest in contributions to ESOP fully vest		3 years
Contributions to the ESOP		$ 4,900	$ 4,200	$ 4,800
ESOP expense recorded		$ 5,000
Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Contributions to defined contribution plan	$ 2,900
CSWI
Defined Benefit Plan Disclosure [Line Items]
Shares held in ESOP (in shares)		352,741	432,912

CONSOLIDATION OF VARIABLE INTEREST ENTITIES AND REDEEMABLE NONCONTROLLING INTEREST

12 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

CONSOLIDATION OF VARIABLE INTEREST ENTITIES AND REDEEMABLE NONCONTROLLING INTEREST

CONSOLIDATION OF VARIABLE INTEREST ENTITY AND REDEEMABLE NONCONTROLLING INTEREST

Whitmore Joint Venture

On April 1, 2021, Whitmore Manufacturing, LLC (“Whitmore”), a wholly-owned subsidiary of CSW, completed the formation of a joint venture (the "Whitmore JV") with Pennzoil-Quaker State Company dba SOPUS Products (“Shell”), a wholly-owned subsidiary of Shell Oil Company that comprises Shell’s U.S. lubricants business. The formation was consummated through a transaction in which Whitmore sold to Shell a 50% interest in a wholly-owned subsidiary (containing certain existing operating assets) in exchange for consideration of $13.4 million from Shell in the form of cash ($5.3 million) and intangible assets ($8.1 million).

The Whitmore JV is deemed to be a VIE as the equity investors at risk, as a group, lack the characteristics of a controlling financial interest. The major factor that led to the conclusion that the Company is the primary beneficiary of this VIE is that Whitmore has the power to direct the manufacturing activities, which are considered the most significant activities for the Whitmore JV. The Whitmore JV has been consolidated into the operations of the Company and its activity has been included in our Specialized Reliability Solutions segment since the formation date. Whitmore JV's total net assets are presented below (in thousands):


	March 31, 2026		March 31, 2025
Cash	$	4,628	$	9,591
Accounts receivable, net	9,417		8,407
Inventories, net	4,997		4,823
Prepaid expenses and other current assets	2,033		254
Property, plant and equipment, net	14,228		13,452
Intangible assets, net	4,049		4,859
Other assets	725		598
Total assets	$	40,077	$	41,983

Accounts payable	$	7,250	$	7,755
Accrued and other current liabilities	2,247		1,605
Other long-term liabilities	786		413
Total liabilities	$	10,284	$	9,774

For the year ended March 31, 2026, 2025 and 2024, the Whitmore JV generated net income of $1.6 million, $1.7 million and $1.8 million, respectively.

The Whitmore JV's LLC Agreement contains a put option that gives either member the right to sell its 50% equity interest in the Whitmore JV to the other member at a dollar amount equivalent to 90% of the initiating member's equity interest determined based on the fair market value of the Whitmore JV's net assets. This put option can be exercised, at either member's discretion, by providing written notice to the other member during the month of July 2024 and every two years afterwards. The put option was not exercised in July 2024. This redeemable noncontrolling interest is recorded at the higher of the redemption value or carrying value each reporting period. Changes in redeemable noncontrolling interest for the year ended March 31, 2026 were as follows (in thousands):


	March 31, 2026		March 31, 2025
Balance at the beginning of the fiscal year	$	20,187	$	19,355

Net income attributable to redeemable noncontrolling interest	802		832
Distributions to redeemable noncontrolling interest	(2,000)		—


Ending balance	$	18,989	$	20,187

SHARE-BASED COMPENSATION - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Sep. 17, 2024	Aug. 15, 2024
Stock Compensation Plan \| Equity And Incentive Compensation 2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted (in shares)			1,230,000
Stock Compensation Plan \| Equity And Incentive Compensation 2024 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted (in shares)				850,000
Shares available for issuance (in shares)	784,584
Vesting of performance shares and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted shares outstanding (in shares)	73,159	85,998
Restricted stock awards activities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted shares outstanding (in shares)	173,475	194,149
Granted (in shares)	74,454
Unrecognized compensation costs related to unvested restricted shares	$ 18.0
Weighted average vesting period	1 year 10 months 24 days
Fair value of restricted shares granted	$ 14.3	$ 14.4
Fair value of restricted shares vested	$ 24.7	$ 27.8
Restricted stock awards activities \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, vesting period	36 years
Granted (in shares)	16,982	18,962
Restricted stock awards activities \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity based awards vest and become exercisable	0.00%
Restricted stock awards activities \| Minimum \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity based awards vest and become exercisable	0.00%	0.00%
Restricted stock awards activities \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity based awards vest and become exercisable	200.00%
Restricted stock awards activities \| Maximum \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity based awards vest and become exercisable	200.00%	200.00%

LEASES - Operating Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Lessee, Lease, Description [Line Items]
Right-of-use lease assets/ Assets of business held for sale	$ 68,617	$ 62,061
Short-term lease liabilities/ Liabilities of business held for sale	13,622	11,244
Long-term lease liabilities	61,862	58,120
Total operating lease liabilities	$ 77,882	$ 69,364
Operating lease, right-of-use asset, statement of financial position [Extensible List]	Other assets	Other assets
Operating lease, liability, current, statement of financial position [Extensible List]	Accrued and other current liabilities	Accrued and other current liabilities
Operating lease, liability, noncurrent, statement of financial position [Extensible List]	Other long-term liabilities	Other long-term liabilities
Disposal Group, Held-for-Sale, Not Discontinued Operations
Lessee, Lease, Description [Line Items]
Right-of-use lease assets/ Assets of business held for sale	$ 2,385	$ 0
Short-term lease liabilities/ Liabilities of business held for sale	$ 2,398	$ 0

LEASES - Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Leases [Abstract]
2027	$ 17,840
2028	16,450
2029	14,933
2030	12,545
2031	9,042
Thereafter	23,265
Total lease liabilities	94,075
Less: Imputed interest	(16,193)
Total operating lease liabilities	$ 77,882	$ 69,364

SEGMENTS - Schedule of Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenues, net	$ 1,082,549	$ 878,301	$ 792,840
Cost of revenues	628,867	484,989	442,095
Selling, general, and administrative expenses	269,520	212,064	190,119
Impairment expenses	15,627		1,508
Operating income	168,535	181,248	159,118
Depreciation and amortization	67,072	42,222	38,290
Capital expenditures	17,257	16,266	16,575
TOTAL ASSETS	2,316,684	1,379,065	1,043,326
Contractor Solutions
Segment Reporting Information [Line Items]
Revenues, net	802,703	609,706	528,641
Engineered Building Solutions
Segment Reporting Information [Line Items]
Impairment expenses	13,600
Reportable Segments
Segment Reporting Information [Line Items]
Revenues, net	1,082,549	878,301	792,840
Cost of revenues	636,656	492,781	450,103
Selling, general, and administrative expenses	241,479	185,559	166,230
Impairment expenses	15,627		1,508
Operating income	196,576	207,753	183,007
Depreciation and amortization	66,960	42,045	38,117
Capital expenditures	17,079	16,160	16,502
TOTAL ASSETS	2,295,366	1,168,097	1,027,485
Reportable Segments \| Contractor Solutions
Segment Reporting Information [Line Items]
Revenues, net	802,703	609,706	528,641
Cost of revenues	458,749	326,611	286,203
Selling, general, and administrative expenses	175,891	124,828	106,746
Impairment expenses	0		1,508
Operating income	175,676	165,893	142,037
Depreciation and amortization	59,408	34,666	30,231
Capital expenditures	12,665	12,667	8,754
TOTAL ASSETS	2,046,280	941,087	806,261
Reportable Segments \| Specialized Reliability Solutions
Segment Reporting Information [Line Items]
Revenues, net	159,954	147,476	149,458
Cost of revenues	103,214	93,941	95,894
Selling, general, and administrative expenses	34,817	31,028	31,453
Impairment expenses	0		0
Operating income	22,079	22,673	22,266
Depreciation and amortization	5,725	5,553	6,074
Capital expenditures	3,528	2,453	5,602
TOTAL ASSETS	179,908	145,663	139,968
Reportable Segments \| Engineered Building Solutions
Segment Reporting Information [Line Items]
Revenues, net	119,892	121,119	114,741
Cost of revenues	74,693	72,229	68,006
Selling, general, and administrative expenses	30,771	29,703	28,031
Impairment expenses	15,627		0
Operating income	(1,179)	19,187	18,704
Depreciation and amortization	1,827	1,826	1,812
Capital expenditures	886	1,040	2,146
TOTAL ASSETS	69,178	81,347	81,256
Intersegment revenue
Segment Reporting Information [Line Items]
Revenues, net	7,789	7,792	8,008
Intersegment revenue \| Contractor Solutions
Segment Reporting Information [Line Items]
Revenues, net	7,613	7,626	7,853
Intersegment revenue \| Specialized Reliability Solutions
Segment Reporting Information [Line Items]
Revenues, net	156	166	155
Intersegment revenue \| Engineered Building Solutions
Segment Reporting Information [Line Items]
Revenues, net	20	0	0
Eliminations and Other
Segment Reporting Information [Line Items]
Revenues, net	(7,789)	(7,792)	(8,008)
Cost of revenues	(7,789)	(7,792)	(8,008)
Selling, general, and administrative expenses	28,041	26,505	23,889
Impairment expenses	0		0
Operating income	(28,041)	(26,505)	(23,889)
Depreciation and amortization	112	177	173
Capital expenditures	178	106	73
TOTAL ASSETS	$ 21,318	$ 210,968	$ 15,841

SEGMENTS (Tables)

12 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Financial Information of Reporting Segments

The following is a summary of the financial information of our reporting segments reconciled to the amounts reported in the consolidated financial statements (in thousands).


Year Ended March 31, 2026
(in thousands)	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Subtotal - Reportable Segments		Eliminations and Other		Total
Revenues, net to external customers	$	802,703	$	159,954	$	119,892	$	1,082,549	$	—	$	1,082,549
Intersegment revenue	7,613		156		20		7,789		(7,789)		—
Cost of revenues	458,749		103,214		74,693		636,656		(7,789)		628,867
Selling, general, and administrative expenses	175,891		34,817		30,771		241,479		28,041		269,520
Impairment expense	—		—		15,627		15,627		—		15,627
Operating income	175,676		22,079		(1,179)		196,576		(28,041)		168,535
Depreciation and amortization	59,408		5,725		1,827		66,960		112		67,072
Capital expenditures	12,665		3,528		886		17,079		178		17,257


Year Ended March 31, 2025
(in thousands)	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Subtotal - Reportable Segments		Eliminations and Other		Total
Revenues, net to external customers	$	609,706	$	147,476	$	121,119	$	878,301	$	—	$	878,301
Intersegment revenue	7,626		166		—		7,792		(7,792)		—
Cost of revenues	326,611		93,941		72,229		492,781		(7,792)		484,989
Selling, general, and administrative expenses	124,828		31,028		29,703		185,559		26,505		212,064
Operating income	165,893		22,673		19,187		207,753		(26,505)		181,248
Depreciation and amortization	34,666		5,553		1,826		42,045		177		42,222
Capital expenditures	12,667		2,453		1,040		16,160		106		16,266


Year Ended March 31, 2024
(in thousands)	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Subtotal - Reportable Segments		Eliminations and Other		Total
Revenues, net to external customers	$	528,641	$	149,458	$	114,741	$	792,840	$	—	$	792,840
Intersegment revenue	7,853		155		—		8,008		(8,008)		—
Cost of revenues	286,203		95,894		68,006		450,103		(8,008)		442,095
Selling, general, and administrative expenses	106,746		31,453		28,031		166,230		23,889		190,119
Impairment expenses	1,508		—		—		1,508		—		1,508
Operating income	142,037		22,266		18,704		183,007		(23,889)		159,118
Depreciation and amortization	30,231		6,074		1,812		38,117		173		38,290
Capital expenditures	8,754		5,602		2,146		16,502		73		16,575


TOTAL ASSETS
(Amounts in thousands)	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Subtotal - Reportable Segments		Eliminations and Other		Total
March 31, 2026	$	2,046,280	$	179,908	$	69,178	$	2,295,366	$	21,318	$	2,316,684
March 31, 2025	941,087		145,663		81,347		1,168,097		210,968		1,379,065
March 31, 2024	806,261		139,968		81,256		1,027,485		15,841		1,043,326

Schedule of Revenues and Long-Lived Assets by Geographic Area

Revenues and long-lived assets by geographic area are as follows (in thousands, except percent data):


	Year Ended March 31,
	2026				2025				2024
U.S.	$	968,626	89.5	%	$	771,018	87.8	%	$	703,282	88.7	%
Non-U.S. (a)	113,923		10.5	%	107,283		12.2	%	89,558		11.3	%
Revenues, net	$	1,082,549	100.0	%	$	878,301	100.0	%	$	792,840	100.0	%

(a) No individual country within this group represents 10% or more of consolidated totals for any period presented.


	Year Ended March 31,
	2026				2025				2024
U.S.	$	1,702,636	98.6	%	$	748,303	95.2	%	$	672,887	94.5	%
Non-U.S.	24,982		1.4	%	37,901		4.8	%	39,030		5.5	%
Long-lived assets (a)	$	1,727,618	100.0	%	$	786,204	100.0	%	$	711,918	100.0	%

(a) Long-lived assets consist primarily of property, plant and equipment, intangible assets, goodwill and other assets.

SHARE-BASED COMPENSATION - Restricted Stock Activity (Details) - Restricted stock awards activities	12 Months Ended
	Mar. 31, 2026 $ / shares shares
Number of Shares
Outstanding at beginning of period (in shares) \| shares	194,149
Granted (in shares) \| shares	74,454
Vested (in shares) \| shares	(90,813)
Canceled (in shares) \| shares	(4,315)
Outstanding at end of period (in shares) \| shares	173,475
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in USD per share) \| $ / shares	$ 203.62
Granted (in USD per share) \| $ / shares	316.53
Vested (in USD per share) \| $ / shares	185.80
Canceled (in USD per share) \| $ / shares	254.43
Outstanding at end of period (in USD per share) \| $ / shares	$ 236.56

ORGANIZATION AND OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Property, Plant and Equipment (Details)	Mar. 31, 2026
Minimum \| Land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	5 years
Minimum \| Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	7 years
Minimum \| Plant, office and lab equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	5 years
Maximum \| Land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	40 years
Maximum \| Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	40 years
Maximum \| Plant, office and lab equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	10 years

REVENUE RECOGNITION - Narrative (Details) $ in Thousands	12 Months Ended
REVENUE RECOGNITION - Narrative (Details) $ in Thousands	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Number of business segments \| segment	3
Accounts receivable, net \| $	$ 210,264	$ 155,651	$ 142,700
Build-to-order
Disaggregation of Revenue [Line Items]
Retainage, percentage of transaction price not collectible until overall construction project is complete	10.00%
Installation Services \| Net Revenues \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	2.00%

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands									3 Months Ended	5 Months Ended	11 Months Ended	12 Months Ended
ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands	Mar. 12, 2026	Nov. 20, 2025	Nov. 05, 2025	Nov. 04, 2025	May 01, 2025	Nov. 04, 2024	Aug. 01, 2024	Feb. 06, 2024	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Business Combination [Line Items]
Cash paid for acquisitions												$ 1,021,233	$ 84,684	$ 29,779
Additions				$ 4,000									15,000
Goodwill									$ 632,631	$ 632,631	$ 632,631	632,631	264,092	247,191
Long-term contingent consideration liability									5,175	5,175	5,175	5,175	12,235
Acquisition-related contingent consideration liabilities									16,700	16,700	16,700	16,700	24,400
Trademarks
Business Combination [Line Items]
Fair value of the assets acquired, indefinite-lived								$ 1,000
Dusk Acquisition Corporation
Business Combination [Line Items]
Percent of outstanding equity acquired				100.00%
Cash				$ 6,000
Cash paid for acquisitions				650,000
Estimated cash at closing				4,100
Additions				$ 4,000
Business combination target period				1 year
Purchase price, amount transferred				$ 658,100
Long-term contingent consideration liability				4,000
MARS
Business Combination [Line Items]
Business combination, consideration transferred				667,536					658,136	658,136	658,136	658,136
Cash				5,973					5,973	5,973	5,973	5,973
Goodwill				264,981					251,616	251,616	251,616	251,616
Tax basis in goodwill				120,000
Customer Lists				$ 142,500
Remaining tax life				14 years
Revenues										60,100
Income before income taxes										3,900
Transaction expenses incurred									3,500
Inventory				$ 54,520					52,353	52,353	52,353	52,353
Accounts Receivable				16,296					16,315	16,315	16,315	16,315
Property, Plant and Equipment				6,644					6,644	6,644	6,644	6,644
Other current assets				1,606					1,096	1,096	1,096	1,096
MARS \| Customer Lists
Business Combination [Line Items]
Customer Lists				$ 349,000					354,000	354,000	354,000	354,000
Assets acquired, amortization period					15 years
Aspen Manufacturing acquisition
Business Combination [Line Items]
Percent of outstanding equity acquired					100.00%
Business combination, consideration transferred					$ 325,878				327,573	327,573	327,573	327,573
Cash					2,289				2,289	2,289	2,289	2,289
Cash paid for acquisitions					313,500
Goodwill					100,421				100,493	100,493	100,493	100,493
Tax basis in goodwill					94,700
Customer Lists					187,000				165,000	165,000	165,000	165,000
Revenues											131,700
Income before income taxes											17,300
Transaction expenses incurred												400	1,100
Working capital and closing cash adjustments					14,100
Purchase price, amount transferred					327,600
Trade Name (indefinite life)									22,000	22,000	22,000	22,000
Inventory					$ 30,851				31,161	31,161	31,161	31,161
Assets acquired, amortization period					15 years
Accounts Receivable					$ 15,253				15,191	15,191	15,191	15,191
Property, Plant and Equipment					7,916				7,916	7,916	7,916	7,916
Other current assets					150				150	150	150	150
Aspen Manufacturing acquisition \| Customer Lists
Business Combination [Line Items]
Customer Lists					$ 165,000
Assets acquired, amortization period					15 years
MARS Parts and Aspen Manufacturing
Business Combination [Line Items]
Amortization, inventory step-up												3,900	3,900
Depreciation												100	700
Warranty insurance expense												500	1,200
Transaction expenses												4,800	5,900
Estimated additional interest expense												20,800	52,100
Estimated operating expense savings												3,800	3,500
Income tax expense (benefit)												7,000	22,600
MARS Parts and Aspen Manufacturing \| Fair Value Adjustments to Inventory
Business Combination [Line Items]
Amortization												14,700	34,600
Joyce Sales Group, LLC and Cooper2Glass, LLC
Business Combination [Line Items]
Goodwill	$ 13,300
Customer Lists	6,900
Transaction expenses incurred												100
Purchase price, amount transferred	21,000
Inventory	$ 800
Assets acquired, amortization period	15 years
Joyce Sales Group, LLC and Cooper2Glass, LLC \| Trademarks
Business Combination [Line Items]
Trade Name (indefinite life)	$ 2,000
Joyce Sales Group, LLC and Cooper2Glass, LLC \| Customer Lists
Business Combination [Line Items]
Customer Lists	$ 4,900
Assets acquired, amortization period	15 years
ProAction Fluids, LLC
Business Combination [Line Items]
Goodwill		$ 6,800
Customer Lists		1,900
Transaction expenses incurred												200
Purchase price, amount transferred		9,500
Inventory		$ 700
Assets acquired, amortization period		15 years
Fair value of other assets		$ 100
ProAction Fluids, LLC \| Trademarks
Business Combination [Line Items]
Trade Name (indefinite life)		500
ProAction Fluids, LLC \| Customer Lists
Business Combination [Line Items]
Customer Lists		$ 1,400
Assets acquired, amortization period		15 years
Hydrotex Holdings, Inc.
Business Combination [Line Items]
Cash paid for acquisitions			$ 17,000
Goodwill			2,800
Customer Lists			8,900
Transaction expenses incurred												500
Working capital and closing cash adjustments			100
Purchase price, amount transferred			17,000
Inventory			$ 3,500
Assets acquired, amortization period			15 years
Fair value of other assets			$ 900
Accounts Receivable			1,600
Fair value of other current asset			100
Fair value of current liabilities assumed			700
Hydrotex Holdings, Inc. \| Trademarks
Business Combination [Line Items]
Trade Name (indefinite life)			1,300
Hydrotex Holdings, Inc. \| Customer Lists
Business Combination [Line Items]
Customer Lists			$ 7,600
Assets acquired, amortization period			15 years
PF WaterWorks acquisition
Business Combination [Line Items]
Cash paid for acquisitions						$ 40,000
Business combination target period						3 years 2 months 12 days
Goodwill						$ 10,900
Customer Lists						29,900
Transaction expenses incurred												0	1,400
Working capital and closing cash adjustments						2,600
Purchase price, amount transferred						45,800
Inventory						$ 3,800
Assets acquired, amortization period						15 years
Fair value of other assets						$ 400
Accounts Receivable						1,500
Fair value of other current asset						200
Fair value of current liabilities assumed						700
Long-term contingent consideration liability						3,200
Other liabilities						100
PF WaterWorks acquisition \| Trademarks
Business Combination [Line Items]
Trade Name (indefinite life)						3,100
PF WaterWorks acquisition \| Patents
Business Combination [Line Items]
Trade Name (indefinite life)						600
PF WaterWorks acquisition \| Customer Lists
Business Combination [Line Items]
Customer Lists						$ 26,200
Assets acquired, amortization period						15 years
PF WaterWorks acquisition \| Patents
Business Combination [Line Items]
Assets acquired, amortization period						5 years
PSP Products acquisition
Business Combination [Line Items]
Cash paid for acquisitions							$ 32,500
Business combination target period							2 years 6 months
Goodwill							$ 7,300
Customer Lists							32,400
Transaction expenses incurred													500
Working capital and closing cash adjustments							7,000
Purchase price, amount transferred							51,300
Inventory							$ 8,900
Assets acquired, amortization period							15 years
Accounts Receivable							$ 4,400
Fair value of other current asset							300
Fair value of current liabilities assumed							2,700
Long-term contingent consideration liability							11,800
Acquisition-related contingent consideration liabilities													$ 2,100
Payment for contingent consideration									7,000
Property, Plant and Equipment							300
Fair value of other asset							700
Fair value of other liabilities							300
PSP Products acquisition \| Valuation Technique, Option Pricing Model
Business Combination [Line Items]
Long-term contingent consideration liability							4,800
PSP Products acquisition \| Valuation Technique, Consensus Pricing Model
Business Combination [Line Items]
Long-term contingent consideration liability							7,000
PSP Products acquisition \| Trademarks
Business Combination [Line Items]
Trade Name (indefinite life)							2,400
PSP Products acquisition \| Customer Lists
Business Combination [Line Items]
Customer Lists							$ 30,000
Assets acquired, amortization period							15 years
Dust Free acquisition
Business Combination [Line Items]
Percent of outstanding equity acquired								100.00%
Cash								$ 600
Cash paid for acquisitions								$ 27,900
Business combination target period								6 years
Goodwill								$ 3,700	632,631	$ 632,631	$ 632,631	$ 632,631
Customer Lists								21,700
Transaction expenses incurred														$ 700
Purchase price, amount transferred								34,200
Inventory								$ 4,100
Assets acquired, amortization period								15 years
Accounts Receivable								$ 2,900
Fair value of other current asset								400
Fair value of current liabilities assumed								2,300
Long-term contingent consideration liability								6,800
Payment for contingent consideration									$ 4,700
Cash acquired								600
Working capital true-up receipt								500
Other current assets								3,100
Dust Free acquisition \| Valuation Technique, Option Pricing Model
Business Combination [Line Items]
Long-term contingent consideration liability								2,100
Dust Free acquisition \| Valuation Technique, Consensus Pricing Model
Business Combination [Line Items]
Long-term contingent consideration liability								4,700
Dust Free acquisition \| Trademarks
Business Combination [Line Items]
Trade Name (indefinite life)								1,600
Dust Free acquisition \| Customer Lists
Business Combination [Line Items]
Customer Lists								$ 20,100
Assets acquired, amortization period								15 years
Dust Free acquisition \| Trade Names
Business Combination [Line Items]
Customer Lists								$ 600
Assets acquired, amortization period								2 years

Audit Information	12 Months Ended
Audit Information	Mar. 31, 2026
Audit Information [Abstract]
Auditor Name	GRANT THORNTON LLP
Auditor Location	Dallas, Texas
Auditor Firm ID	248

CONSOLIDATION OF VARIABLE INTEREST ENTITIES AND REDEEMABLE NONCONTROLLING INTEREST - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 01, 2021	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Variable Interest Entity [Line Items]
Net income		$ (112,045)	$ (136,652)	$ (101,648)
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Interest sold (in percent)	50.00%
Proceeds from sale of variable interest entity	$ 5,300
Net income		$ (1,600)	$ (1,700)	$ (1,800)
Initiating member's equity interest (in percent)	90.00%
Option exercise period	2 years
Variable Interest Entity, Primary Beneficiary \| Shell \| Whitmore Manufacturing, LLC
Variable Interest Entity [Line Items]
Interest sold (in percent)	50.00%
Consideration received	$ 13,400
Intangible assets received on disposal of variable interest entity	$ 8,100

BUSINESS HELD FOR SALE AND EXIT ACTIVITIES - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense	$ (15,600)	$ (15,627)	$ 0	$ (1,508)
Impairment	(7,500)	(7,493)	0	0
Impairment expenses		15,634	0	1,600
Tangible asset impairment charges	1,500
Selling, general, and administrative expenses		269,520	212,064	190,119
Cost of revenues		628,867	484,989	442,095
Discontinued Operations, Held-for-Sale \| Greco US Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue		15,700	18,600	15,900
Gain (Loss) from disposal of discontinued operation, before income tax		(1,600)	700	(300)
Discontinued Operations, Held-for-Sale \| Greco Canada Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue		17,700	20,900	17,900
Gain (Loss) from disposal of discontinued operation, before income tax		(700)	$ 2,000	$ 1,800
Operating expenses		2,100
Selling, general, and administrative expenses		700
Cost of revenues		1,400
Discontinued Operations, Held-for-Sale \| Greco Canada Business \| Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cost expect to incur	1,500	1,500
Discontinued Operations, Held-for-Sale \| Greco Canada Business \| Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cost expect to incur	$ 2,000	$ 2,000

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2026	Mar. 31, 2025
Statement of Financial Position [Abstract]
Common shares, par value (in USD per share)	$ 0.01	$ 0.01
Common shares, authorized (in shares)	50,000,000	50,000,000
Common shares, issued (in shares)	17,893,000	17,810,000
Preferred shares, par value (in USD per share)	$ 0.01	$ 0.01
Preferred shares, authorized (in shares)	10,000,000	10,000,000
Preferred shares, issued (in shares)	0	0
Treasury shares (in shares)	1,544,000	1,027,000

INVENTORY

12 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

INVENTORY

Inventories are stated at the lower of cost or net realizable value and include raw materials, supplies, direct labor and manufacturing overhead. Inventories are accounted for using a standard costing methodology, which approximates cost on a first-in, first-out (“FIFO”) basis.

The Inventories, net caption in the Consolidated Balance Sheet is comprised of the following components:


	March 31,
	2026		2025
Raw materials and supplies	$	119,622	$	54,761
Work in process	4,823		5,969
Finished goods	200,700		144,897
Total inventories	325,145		205,627

Less: Obsolescence reserve	(15,438)		(10,751)
Inventories, net	$	309,707	$	194,876

INCOME TAXES - Schedule of Summarized By Jurisdiction, Income Taxes Paid, Net of Refunds (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Federal	$ 31,400	$ 38,263	$ 30,916
State	10,544	9,677	6,448
Foreign	4,472	2,926	1,931
Total	$ 46,416	$ 50,866	$ 39,295

DETAILS OF CERTAIN CONSOLIDATED BALANCE SHEET CAPTIONS - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Right-of-use lease assets	$ 68,617	$ 62,061
Long-term investments	7,300	2,500
Deferred financing fees	2,822	829
Rent receivable	1,862	1,978
Long-term tax indemnification assets	1,210	502
Deferred income taxes	901	350
Long-term derivative asset	447	0
Property held for investment	418	418
Other	3,822	2,149
Other assets	$ 87,399	$ 70,787

LONG-TERM DEBT AND COMMITMENTS - Aggregate Maturities of Long-Term Debt (Details) $ in Thousands	Mar. 31, 2025 USD ($)
Debt Disclosure [Abstract]
2027	$ 30,000
2028	30,000
2029	30,000
2030	30,000
2031	751,500
Total debt, gross	$ 871,500

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

GOODWILL AND INTANGIBLE ASSETS

12 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

The changes in the carrying amount of goodwill for the years ended March 31, 2026 and 2025 were as follows (in thousands):


	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Total
Balance at March, 2024	$	213,544	$	9,358	$	24,289	$	247,191
Dust Free acquisition	(212)		—		—		(212)
PSP Products acquisition	7,323		—		—		7,323
PF WaterWorks acquisition	10,258		—		—		10,258
Currency translation	(33)		79		(514)		(468)
Balance at March 31, 2025	$	230,880	$	9,437	$	23,775	$	264,092
Duckt-Strip acquisition	13,287		—		—		13,287
Impairment	—		—		(7,493)		(7,493)
ProAction Fluids acquisition	—		6,827		—		6,827
Hydrotex acquisition	—		2,795		—		2,795
MARS Parts acquisition	251,616		—		—		251,616
Aspen Manufacturing acquisition	100,492		—		—		100,492
PF WaterWorks acquisition	619		—		—		619
Currency translation	32		86		278		396
Balance at March 31, 2026	$	596,926	$	19,145	$	16,560	$	632,631

We assess goodwill for impairment annually or whenever events or circumstances indicate there may be impairment. During the quarter ended March 31, 2026, we completed our annual quantitative impairment assessment for the Greco business, a standalone reporting unit under our Engineered Building Solutions segment, and determined that the fair value of the Greco business was below its carrying value and accordingly recorded a non-cash impairment of $15.6 million, including $7.5 million for goodwill, $6.6 million for intangible assets and $1.5 million for long-lived assets, included in the impairment expenses line in our Consolidated Statement of Income.

The following table provides information about our intangible assets for the years ended March 31, 2026 and 2025 (in thousands, except years):


		March 31, 2026				March 31, 2025
	Wtd Avg Life (Years)	Ending Gross Amount		Accumulated Amortization		Ending Gross Amount		Accumulated Amortization
Finite-lived intangible assets:
Patents	10	$	17,785	$	(11,312)	$	17,784	$	(10,189)
Customer lists and amortized trademarks (a)	15	922,925		(165,943)		402,765		(127,551)
Non-compete agreements	6	1,000		(814)		1,000		(639)
Other	10	6,453		(3,514)		6,277		(3,141)
		$	948,163	$	(181,583)	$	427,826	$	(141,520)
Trade names and trademarks not being amortized (a):		$	133,471	$	—	$	71,604	$	—

(a) Refer above for intangible assets impairment discussion.

Amortization expense for the years ended March 31, 2026, 2025 and 2024 was $47.3 million, $25.9 million and $22.6 million, respectively. Of these amounts, cost of revenues includes $0.8 million, $0.7 million and $0.7 million, respectively. The following table presents the estimated future amortization of finite-lived intangible assets for the next five fiscal years ending March 31 (in thousands):


2027	$	60,718
2028	60,320
2029	60,188
2030	59,867
2031	59,754
Thereafter	465,733
Total	$	766,580

FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 04, 2025	Mar. 31, 2026	Mar. 31, 2025
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the year:		$ 24,385	$ 7,445
Cash payments		(11,730)	(160)
Change in fair value of contingent consideration liabilities		$ 0	2,100
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag		Change in fair value of contingent consideration liabilities
Additions	$ 4,000		15,000
Ending balance		$ 16,655	$ 24,385

SHAREHOLDERS' EQUITY

12 Months Ended

Mar. 31, 2026

Equity [Abstract]

SHAREHOLDERS' EQUITY

Common Stock


	March 31, 2026		March 31, 2025
	Common Stock	Treasury Stock	Common Stock	Treasury Stock
Beginning of the year	17,809,590	1,026,941	16,465,776	952,394
Vesting of performance shares and restricted stock units	59,637	22,416	58,640	21,745
Reissuance of treasury shares	—	(15,539)	—	(17,186)
Restricted stock awards activities	23,832	6,897	20,174	10,786
Share repurchases	—	503,076	—	59,202
Equity issuance	—	—	1,265,000	—
End of the year	17,893,059	1,543,791	17,809,590	1,026,941

Equity Offering

In September 2024, the Company completed a follow-on equity offering, pursuant to which we issued and sold a total of 1,265,000 shares of our common stock to the public, including shares issued pursuant to the underwriters' full exercise of their over-allotment option, at an offering a price of $285 per share. We received proceeds of $347.4 million, net of underwriting fees and discounts and expenses incurred directly related to the offering. We used a portion of the proceeds to pay off the outstanding balance of our RCF, as discussed in Note 9, and used the remainder of the proceeds for general corporate purposes, including the completed acquisitions of PF WaterWorks (discussed in Note 2) and, following fiscal year end, Aspen Manufacturing (discussed in Note 2).

Share Repurchase Programs

On December 16, 2022, we announced that our Board of Directors authorized a program to repurchase up to $100.0 million of our common stock over a two-year time period. On November 18, 2024, we announced that our Board of Directors authorized a new $200.0 million share repurchase program, which replaced the previously announced $100.0 million program. On December 15, 2025, we announced an expansion of our current share repurchase program authorization from $200.0 million

to $250.0 million. Under the current repurchase program, shares may be repurchased from time to time in the open market or in privately negotiated transactions. Repurchases will be made at our discretion, based on ongoing assessments of the capital needs of the business, the market price of our common stock and general market conditions. Our Board of Directors has established an expiration of December 31, 2026 for completion of the new repurchase program; however, the program may be limited or terminated at any time at our discretion without notice.

Under the current $250.0 million repurchase program, 503,076 and 20,045 shares were repurchased during the year ended March 31, 2026 and 2025, respectively, for $127.5 million and $6.8 million, respectively. Under the prior $100.0 million repurchase program, no shares were repurchased during the year ended March 31, 2026 and 39,157 shares were repurchased during the year ended March 31, 2025 for $11.5 million. A total of 92,290 shares had been repurchased for an aggregate amount of $21.9 million under the prior $100.0 million program. As of March 31, 2026, a total of 523,121 shares were repurchased for an aggregate amount of $134.3 million under the current $250.0 million program.

In connection with the vesting of share awards, 29,313 and 32,531 shares were tendered by employees to satisfy minimum tax withholding requirements during years ended March 31, 2026 and 2025, respectively, for $8.1 million and $9.4 million, respectively.

Dividends

On April 4, 2019, we announced we had commenced a dividend program and that our Board of Directors approved a regular quarterly dividend of $0.135 per share. On April 12, 2024, we announced a quarterly dividend increase to $0.21 per share. On October 11, 2024, we announced a quarterly dividend increase to $0.24 per share. On April 11, 2025, we announced a quarterly dividend increase to $0.27 per share. On April 2, 2026, we announced a quarterly dividend increase to $0.30 per share, which was paid on May 8, 2026 to shareholders of record as of April 24, 2026. Any future dividends at the existing $0.30 per share quarterly rate or otherwise will be reviewed individually and declared by our Board of Directors in its discretion. Total dividends of $18.0 million and $14.6 million were paid during the years ended March 31, 2026 and 2025, respectively.

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478448/946-505-50-6

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-6

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/505/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-16

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

+ Details

GOODWILL AND INTANGIBLE ASSETS - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Goodwill [Roll Forward]
Beginning balance		$ 264,092	$ 247,191
Impairment	$ (7,500)	(7,493)	0	$ 0
Currency translation		396	(468)
Ending balance	632,631	632,631	264,092	247,191
Dust Free acquisition
Goodwill [Roll Forward]
Goodwill, acquired			(212)
Ending balance	632,631	632,631
PSP Products acquisition
Goodwill [Roll Forward]
Goodwill, acquired			(7,323)
PF WaterWorks acquisition
Goodwill [Roll Forward]
Goodwill, acquired			(10,258)
Duckt-Strip acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(13,287)
ProAction Fluids acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(6,827)
Hydrotex acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(2,795)
MARS Parts acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(251,616)
Aspen Manufacturing acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(100,492)
Ending balance	100,493	100,493
PF WaterWorks acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(619)
Contractor Solutions
Goodwill [Roll Forward]
Beginning balance		230,880	213,544
Impairment		0
Currency translation		32	(33)
Ending balance			230,880	213,544
Contractor Solutions \| Dust Free acquisition
Goodwill [Roll Forward]
Goodwill, acquired			(212)
Ending balance	596,926	596,926
Contractor Solutions \| PSP Products acquisition
Goodwill [Roll Forward]
Goodwill, acquired			(7,323)
Contractor Solutions \| PF WaterWorks acquisition
Goodwill [Roll Forward]
Goodwill, acquired			(10,258)
Contractor Solutions \| Duckt-Strip acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(13,287)
Contractor Solutions \| ProAction Fluids acquisition
Goodwill [Roll Forward]
Goodwill, acquired		0
Contractor Solutions \| Hydrotex acquisition
Goodwill [Roll Forward]
Goodwill, acquired		0
Contractor Solutions \| MARS Parts acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(251,616)
Contractor Solutions \| Aspen Manufacturing acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(100,492)
Contractor Solutions \| PF WaterWorks acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(619)
Specialized Reliability Solutions
Goodwill [Roll Forward]
Beginning balance		9,437	9,358
Impairment		0
Currency translation		86	79
Ending balance			9,437	9,358
Specialized Reliability Solutions \| Dust Free acquisition
Goodwill [Roll Forward]
Goodwill, acquired			0
Ending balance	19,145	19,145
Specialized Reliability Solutions \| PSP Products acquisition
Goodwill [Roll Forward]
Goodwill, acquired			0
Specialized Reliability Solutions \| PF WaterWorks acquisition
Goodwill [Roll Forward]
Goodwill, acquired			0
Specialized Reliability Solutions \| Duckt-Strip acquisition
Goodwill [Roll Forward]
Goodwill, acquired		0
Specialized Reliability Solutions \| ProAction Fluids acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(6,827)
Specialized Reliability Solutions \| Hydrotex acquisition
Goodwill [Roll Forward]
Goodwill, acquired		(2,795)
Specialized Reliability Solutions \| MARS Parts acquisition
Goodwill [Roll Forward]
Goodwill, acquired		0
Specialized Reliability Solutions \| Aspen Manufacturing acquisition
Goodwill [Roll Forward]
Goodwill, acquired		0
Specialized Reliability Solutions \| PF WaterWorks acquisition
Goodwill [Roll Forward]
Goodwill, acquired		0
Engineered Building Solutions
Goodwill [Roll Forward]
Beginning balance		23,775	24,289
Impairment		(7,493)
Currency translation		278	(514)
Ending balance			23,775	$ 24,289
Engineered Building Solutions \| Dust Free acquisition
Goodwill [Roll Forward]
Goodwill, acquired			0
Ending balance	$ 16,560	16,560
Engineered Building Solutions \| PSP Products acquisition
Goodwill [Roll Forward]
Goodwill, acquired			0
Engineered Building Solutions \| PF WaterWorks acquisition
Goodwill [Roll Forward]
Goodwill, acquired			$ 0
Engineered Building Solutions \| Duckt-Strip acquisition
Goodwill [Roll Forward]
Goodwill, acquired		0
Engineered Building Solutions \| ProAction Fluids acquisition
Goodwill [Roll Forward]
Goodwill, acquired		0
Engineered Building Solutions \| Hydrotex acquisition
Goodwill [Roll Forward]
Goodwill, acquired		0
Engineered Building Solutions \| MARS Parts acquisition
Goodwill [Roll Forward]
Goodwill, acquired		0
Engineered Building Solutions \| Aspen Manufacturing acquisition
Goodwill [Roll Forward]
Goodwill, acquired		0
Engineered Building Solutions \| PF WaterWorks acquisition
Goodwill [Roll Forward]
Goodwill, acquired		$ 0

REVENUE RECOGNITION - Schedule of Accounts Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of the year:	$ 1,137	$ 908
Reserve	2,279	1,408
Write offs, net of recoveries	(1,101)	(1,179)
Ending balance	$ 2,314	$ 1,137

GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the years ended March 31, 2026 and 2025 were as follows (in thousands):


	Contractor Solutions		Specialized Reliability Solutions		Engineered Building Solutions		Total
Balance at March, 2024	$	213,544	$	9,358	$	24,289	$	247,191
Dust Free acquisition	(212)		—		—		(212)
PSP Products acquisition	7,323		—		—		7,323
PF WaterWorks acquisition	10,258		—		—		10,258
Currency translation	(33)		79		(514)		(468)
Balance at March 31, 2025	$	230,880	$	9,437	$	23,775	$	264,092
Duckt-Strip acquisition	13,287		—		—		13,287
Impairment	—		—		(7,493)		(7,493)
ProAction Fluids acquisition	—		6,827		—		6,827
Hydrotex acquisition	—		2,795		—		2,795
MARS Parts acquisition	251,616		—		—		251,616
Aspen Manufacturing acquisition	100,492		—		—		100,492
PF WaterWorks acquisition	619		—		—		619
Currency translation	32		86		278		396
Balance at March 31, 2026	$	596,926	$	19,145	$	16,560	$	632,631

Schedule of Intangible Assets

The following table provides information about our intangible assets for the years ended March 31, 2026 and 2025 (in thousands, except years):


		March 31, 2026				March 31, 2025
	Wtd Avg Life (Years)	Ending Gross Amount		Accumulated Amortization		Ending Gross Amount		Accumulated Amortization
Finite-lived intangible assets:
Patents	10	$	17,785	$	(11,312)	$	17,784	$	(10,189)
Customer lists and amortized trademarks (a)	15	922,925		(165,943)		402,765		(127,551)
Non-compete agreements	6	1,000		(814)		1,000		(639)
Other	10	6,453		(3,514)		6,277		(3,141)
		$	948,163	$	(181,583)	$	427,826	$	(141,520)
Trade names and trademarks not being amortized (a):		$	133,471	$	—	$	71,604	$	—

(a) Refer above for intangible assets impairment discussion.

Schedule of Estimated Future Amortization For Intangible Assets

The following table presents the estimated future amortization of finite-lived intangible assets for the next five fiscal years ending March 31 (in thousands):


2027	$	60,718
2028	60,320
2029	60,188
2030	59,867
2031	59,754
Thereafter	465,733
Total	$	766,580

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1A

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-2

+ Details

ORGANIZATION AND OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Consolidation

Variable Interest Entities

Use of Estimates

•Deferred taxes and tax reserves; and

•Valuation of goodwill and indefinite-lived intangible assets.

Cash and Cash Equivalents

Accounts Receivable, Allowance for Credit Losses and Credit Risk

Credit Risks

Inventories and Related Reserves

Property, Plant and Equipment


Land improvements	5	to	40 years
Buildings and improvements	7	to	40 years
Plant, office and lab equipment	5	to	10 years

We review property, plant and equipment for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable.

Business Held for Sale

Exit and Disposal Activities

Valuation of Goodwill and Intangible Assets

Intangible Assets

Property Held for Investment

Deferred Loan Costs

Fair Values of Financial Instruments

Level I – Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Contingent consideration

Leases

obligation is incurred.

Derivative Instruments and Hedge Accounting

Pension Obligations

Redeemable Noncontrolling Interests

Revenue Recognition

(v) We recognize revenue when, or as, we satisfy the performance obligation in a contract by transferring control of a promised good or service to the customer.

Research and Development ("R&D")

Share-based Compensation

Income Taxes, Deferred Taxes and Tax Valuation Allowances

Unremitted Earnings

Uncertain Tax Positions

Earnings Per Share

Foreign Currency Translation

Segments

Accounting Developments

Pronouncements implemented

Pronouncements not yet implemented

Form 10-Q for the first quarter of 2028. We are currently evaluating the impact this ASU may have on our financial statement disclosures.

DETAILS OF CERTAIN CONSOLIDATED BALANCE SHEET CAPTIONS - Schedule of Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Compensation and related benefits	$ 39,261	$ 31,381
Rebates and marketing agreements	26,900	19,650
Operating lease liabilities	13,622	11,244
Short-term contingent consideration liability	11,580	12,150
Non-income taxes	3,941	2,409
Income taxes payable	2,336	3,075
Billings in excess of costs	1,544	932
Other accrued expenses	16,871	11,594
Accrued and other current liabilities	$ 116,055	$ 92,435

CONSOLIDATION OF VARIABLE INTEREST ENTITIES AND REDEEMABLE NONCONTROLLING INTEREST - Schedule of Changes In Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Equity, Attributable to Noncontrolling Interest [Roll Forward]
Balance at the beginning of the fiscal year	$ 20,187
Ending balance	18,989	$ 20,187
Variable Interest Entity, Primary Beneficiary
Equity, Attributable to Noncontrolling Interest [Roll Forward]
Balance at the beginning of the fiscal year	20,187	19,355
Net income attributable to redeemable noncontrolling interest	802	832
Distributions to redeemable noncontrolling interest	(2,000)	0
Ending balance	$ 18,989	$ 20,187

SEGMENTS - Schedule of Sales and Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues, net	$ 1,082,549	$ 878,301	$ 792,840
Long-lived assets	$ 1,727,618	$ 786,204	$ 711,918
Net Revenues \| Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
Long-lived Assets \| Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues, net	$ 968,626	$ 771,018	$ 703,282
Long-lived assets	$ 1,702,636	$ 748,303	$ 672,887
U.S. \| Net Revenues \| Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	89.50%	87.80%	88.70%
U.S. \| Long-lived Assets \| Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	98.60%	95.20%	94.50%
Non-U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues, net	$ 113,923	$ 107,283	$ 89,558
Long-lived assets	$ 24,982	$ 37,901	$ 39,030
Non-U.S. \| Net Revenues \| Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	10.50%	12.20%	11.30%
Non-U.S. \| Long-lived Assets \| Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	1.40%	4.80%	5.50%

- Definition

+ References + Details

- Definition

+ References

+ Details

LEASES - Additional Information (Details)	Mar. 31, 2026
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	22 years

ACQUISITIONS

12 Months Ended

Mar. 31, 2026

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

ACQUISITIONS

Dusk Acquisition Corporation

On November 4, 2025, we acquired 100% of the equity interests of Dusk Acquisition Corporation and its wholly owned subsidiaries, Motors & Armatures, LLC and HVAC South, LLC (collectively, “MARS Parts”), based in Hauppauge, New York, for an aggregate purchase price of $658.1 million (including $6.0 million cash acquired), comprised of cash consideration of $650.0 million, estimated cash on balance sheet at closing of $4.1 million, and contingent considerations initially measured at $4.0 million based on MARS Parts meeting defined financial targets over a period of one year. The cash consideration was funded with a combination of the TLA (as defined in Note 9) and borrowings under our existing RCF (as defined in Note 9). As of the acquisition date, the estimated fair value of the contingent consideration was classified as a current liability of $4.0 million, which was determined using an option pricing model simulation that determines an average projected payment value across numerous iterations. MARS Parts was one of the largest providers of HVAC/R parts and supplies in North America, and a leading provider of motors and capacitors. With a product mix more heavily focused on repair versus replacement, we expect MARS Parts will strategically complement our current HVAC/R end market, which traditionally has been more focused on new unit installations and replacements.

The MARS Parts acquisition was accounted for as a business combination under FASB Accounting Standards Codification Topic 805, Business Combinations ("Topic 805"). Pursuant to Topic 805, the Company allocated the MARS Parts purchase price to tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date, November 4, 2025. The excess of the purchase price over those fair values was recorded to goodwill. The Company's evaluation of the facts and circumstances available as of November 4, 2025, to assign fair values to assets acquired and liabilities assumed, including income tax related amounts, is ongoing. The primary areas of preliminary purchase accounting price allocation subject to changes relate to the valuation of working capitals, property, plant and equipment and deferred tax balances. As a result of further refining the assumptions used in the valuation and identification of information existed on the acquisition date, the Company recorded measurement period adjustments to the initial opening balance sheet as shown in the table below. We expect to finalize the purchase price allocation as soon as practicable, but no later than one year from the acquisition date. The following table summarizes the Company's best initial estimate of the aggregate fair value of the assets acquired and liabilities assumed at the date of acquisition (in thousands):


	Initial Estimated Fair Value		Measurement Period Adjustments		Updated Estimated Fair Value
Cash	$	5,973	$	—	$	5,973
Accounts Receivable	16,296		19		16,315
Inventory	54,520		(2,167)		52,353
Income Tax Receivable	1,934		1,028		2,962
Other Current Assets	1,606		(510)		1,096
Property, Plant and Equipment	6,644		—		6,644
Trade Name (indefinite life)	45,000		(8,000)		37,000
Customer Lists (useful life of 15 years)	349,000		5,000		354,000
Right-Of-Use Assets	5,205		—		5,205

Other Long-Term Assets	635		—		635
Accounts Payable	(7,645)		(1,682)		(9,327)
Accrued and Other Current Liabilities	(10,729)		231		(10,498)
Lease Liabilities - Short-Term	(1,341)		—		(1,341)

Deferred Tax Liabilities	(60,679)		10,046		(50,633)

Lease Liabilities - Long-Term	(3,864)		—		(3,864)

Estimated fair value of net assets acquired	402,555		3,965		406,520
Goodwill	264,981		(13,365)		251,616
Total Purchase Price	$	667,536	$	(9,400)	$	658,136

Goodwill of $251.6 million represents the excess of the purchase price over the fair value of the underlying tangible and intangible assets acquired and liabilities assumed. The acquisition goodwill represents the value expected to be obtained from expanding the Company’s product offerings more broadly across the HVAC/R end market. The goodwill recorded as part of this acquisition is included in the Contractor Solutions segment. The Company has assumed the seller's tax basis in goodwill ($120.0 million) and intangible assets ($142.5 million), which will continue to be amortized over the remaining tax life of 14 years.

MARS Parts generated net revenue of $60.1 million and net income before income taxes of $3.9 million for the period from the acquisition date to March 31, 2026, including expenses incurred to rapidly integrate the business post acquisition. MARS Parts activity is currently included in our Contractor Solutions segment. During year ended March 31, 2026, the Company incurred $3.5 million of transaction expenses in connection with the MARS Parts acquisition. Transaction expenses are included in selling, general and administrative expenses in the Consolidated Statement of Operations under the Contractor Solutions and Other segments.

Aspen Manufacturing, LLC

On May 1, 2025, we acquired 100% of the equity interests of Aspen Manufacturing, LLC (“Aspen Manufacturing”), based in Humble, Texas, for an aggregate purchase price of $327.6 million (including $2.3 million cash acquired), comprised of cash consideration of $313.5 million and working capital adjustments of $14.1 million. The cash consideration was funded with cash on hand and borrowings under our existing RCF (as defined in Note 9). Aspen Manufacturing was one of the largest independent evaporator coil and air handler manufacturers for the HVAC/R industry and is recognized as a leader in product quality and indoor comfort. Aspen Manufacturing’s product suite includes a vast range of high-quality residential and light commercial evaporator coils, blowers, and air handling units for single-family, multi-family, and manufactured homes.

The Aspen Manufacturing acquisition was accounted for as a business combination under Topic 805. Pursuant to Topic 805, the Company allocated the Aspen Manufacturing purchase price to tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date, May 1, 2025. The excess of the purchase price over those fair values was recorded to goodwill. The Company's evaluation of the facts and circumstances available as of May 1, 2025, to assign fair values to assets acquired and liabilities assumed, including income tax related amounts, is ongoing. The primary areas of preliminary purchase accounting price allocation subject to changes relate to the valuation of working capitals, income tax contingency and related indemnification asset and value of property, plant and equipment. As a result of further refining the estimates used in the valuation and identification of information existed on the acquisition date, the Company recorded measurement period adjustments to the initial opening balance sheet as shown in the table below. We expect to finalize the purchase price allocation as soon as practicable, but no later than one year from the acquisition date. The following table summarizes the Company's best initial estimate of the aggregate fair value of the assets acquired and liabilities assumed at the date of acquisition (in thousands):


	Initial Estimated Fair Value		Measurement Period Adjustments		Updated Estimated Fair Value
Cash	$	2,289	$	—	$	2,289
Accounts Receivable	15,253		(62)		15,191
Inventory	30,851		310		31,161

Other Current Assets	150		—		150
Property, Plant and Equipment	7,916		—		7,916
Trade Name (indefinite life)	22,000		—		22,000
Customer Lists (useful life of 15 years)	165,000		—		165,000
Right-Of-Use Assets	11,855		—		11,855
Long-Term Indemnity Asset	400		572		972
Deferred Tax Assets	—		1,532		1,532
Accounts Payable	(5,459)		—		(5,459)
Accrued and Other Current Liabilities	(8,943)		(157)		(9,100)
Lease Liabilities - Short-Term	(1,019)		—		(1,019)


Contingency Reserve	(400)		(572)		(972)
Lease Liabilities - Long-Term	(10,836)		—		(10,836)
Other Long-Term Liabilities	(3,600)		—		(3,600)
Estimated fair value of net assets acquired	225,457		1,624		227,080
Goodwill	100,421		72		100,493
Total Purchase Price	$	325,878	$	1,696	$	327,573

Goodwill of $100.5 million represents the excess of the purchase price over the fair value of the underlying tangible and intangible assets acquired and liabilities assumed. The acquisition goodwill represents the value expected to be obtained from expanding the Company’s product offerings more broadly across the HVAC/R end market. The goodwill recorded as part of this acquisition is included in the Contractor Solutions segment. The goodwill and intangible assets tax bases are $94.7 million and $187.0 million, respectively, and are deductible and amortized over 15 years.

Aspen Manufacturing generated net revenue of $131.7 million and net income before income taxes of $17.3 million for the period from the acquisition date to March 31, 2026. Aspen Manufacturing activity is currently included in our Contractor Solutions segment. During the year ended March 31, 2026, the Company incurred $0.4 million of transaction expenses in connection with the Aspen Manufacturing acquisition. During the year ended March 31, 2025, the Company incurred $1.1 million of transaction expenses in connection with the Aspen Manufacturing acquisition. Transaction expenses are included in selling, general and administrative expenses in the Consolidated Statement of Operations under the Contractor Solutions and Other segments.

Proforma Consolidated Financial Information


	Year Ended March 31,
	2026		2025
Revenue, net	$	1,232,737	$	1,207,036
Net income attributable to CSW	124,394		115,238

Net income per share attributable to CSW
Basic	$	7.47	$	7.10
Diluted	$	7.44	$	7.06

These proforma results do not present financial results that would have been realized had the acquisition occurred on April 1, 2024, nor are they intended to be a projection of future results. The unaudited proforma results include certain proforma adjustments to net income that were directly attributable to the acquisition, as if the acquisition had occurred on April 1, 2024, including the following:

•Additional amortization expense of $14.7 million and $34.6 million for the years ended March 31, 2026 and 2025, respectively, that would have been recognized as a result of the allocation of purchase consideration to customer lists subject to amortization;

•Excluded amortization expense of $3.9 million for the years ended March 31, 2026 and included additional amortization expense of $3.9 million for the year ended March 31, 2025, related to acquisition inventory step-up;

•Additional depreciation expense of $0.1 million and $0.7 million for the years ended March 31, 2026 and 2025, respectively, that would have been recognized as a result of the fair value step-up of the property, plant and equipment;

•Additional representation and warranty insurance expense of $0.5 million and $1.2 million for the years ended March 31, 2026 and 2025, respectively;

•Excluded transaction expenses of $4.8 million for the the year ended March 31, 2026 and included additional transaction expense of $5.9 million for the the year ended March 31, 2025, that would have been recognized;

•Estimated additional interest expense of $20.8 million and $52.1 million for the years ended March 31, 2026 and 2025, respectively, as a result of incurring additional borrowing;

•Estimated cost and operating expense savings of $3.8 million and $3.5 million for the years ended March 31, 2026 and 2025, respectively, as a result of management operational synergies; and

•Income tax benefit of the proforma adjustments, calculated using a blended statutory income tax rate of 25.0%, of $7.0 million and $22.6 million for the years ended March 31, 2026 and 2025, respectively.

Joyce Sales Group, LLC and Copper2Glass, LLC

On March 12, 2026, we acquired certain assets of Joyce Sales Group, LLC and Copper2Glass, LLC (collectively, “Duckt-Strip”), based in Auburn, New Hampshire for a cash consideration of $21.0 million, which was funded with borrowings under our existing RCF (as defined in Note 9). Duckt-Strip offers a differentiated, code‑compliant electrical cable solution purpose‑built for ductless HVAC/R systems. During the year ended March 31, 2026, we incurred $0.1 million in transaction expenses in connection with the Duckt-Strip acquisition, which were included in selling, general and administrative expenses in the Consolidated Statements of Operations under the Contractor Solutions segment.

The Duckt-Strip acquisition was accounted for as a business combination under Topic 805. The excess of the purchase price over the preliminary fair value of the identifiable assets acquired and liabilities assumed was $13.3 million allocated to goodwill, which represents the value expected to be obtained from owning products that are expanding our existing HVAC/R offerings. The preliminary allocation of the fair value of the net assets acquired comprises customer lists ($4.9 million), trade name ($2.0 million), and inventory ($0.8 million). Customer lists are being amortized over 15 years, while the trade name and goodwill are not being amortized. The Company’s evaluation of the facts and circumstances available as of March 12, 2026 to assign fair values to assets acquired is ongoing. The primary area of preliminary purchase price allocation subject to change relates to the assumptions used in the valuation model. We expect to finalize the purchase price allocation as soon as practicable, but no later than one year from the acquisition date. The goodwill and intangible assets tax bases are $13.3 million and $6.9 million, respectively, and are deductible and amortized over 15 years. Duckt-Strip activity has been included in our Contractor Solutions segment since the acquisition date.

The disclosure of Duckt-Strip's post-acquisition revenue and net income is not practical due to integration activities since the acquisition date. No pro forma information has been provided due to immateriality.

ProAction Fluids, LLC

On November 20, 2025, we acquired certain assets of ProAction Fluids, LLC (“ProAction Fluids”), based in Shreveport, Louisiana for cash consideration of $9.5 million, which was funded with borrowings under our existing RCF (as defined in Note 9). ProAction Fluids offers performance-tested drilling fluids, lubricants, sealants, and compounds for the horizontal directional drilling ("HDD") market that expand upon, and are complementary to, our existing general industrial product portfolio. During the year ended March 31, 2026, we incurred $0.2 million in transaction expenses in connection with the ProAction Fluids acquisition, which were included in selling, general and administrative expenses in the Consolidated Statements of Operations under the Specialized Reliability Solutions segment.

The ProAction Fluids acquisition was accounted for as a business combination under Topic 805. The excess of the purchase price over the preliminary fair value of the identifiable assets acquired and liabilities assumed was $6.8 million allocated to goodwill, which represents the value expected to be obtained from owning products that are expanding our existing general industrial offerings. The preliminary allocation of the fair value of the net assets acquired comprises customer lists ($1.4 million), trade name ($0.5 million), inventory ($0.7 million), and equipment ($0.1 million). Customer lists are being amortized over 15 years, while the trade name and goodwill are not being amortized. The Company’s evaluation of the facts and circumstances available as of November 20, 2025 to assign fair values to assets acquired is ongoing. The primary area of preliminary purchase price allocation subject to change relates to the assumptions used in the valuation model. We expect to finalize the purchase price allocation as soon as practicable, but no later than one year from the acquisition date. The goodwill and intangible assets tax bases are $6.8 million and $1.9 million, respectively, and are deductible and amortized over 15 years. ProAction Fluids activity has been included in our Specialized Reliability Solutions segment since the acquisition date.

The disclosure of ProAction Fluids' post-acquisition revenue and net income is not practical due to integration activities since the acquisition date. No pro forma information has been provided due to immateriality.

Hydrotex Holdings, Inc.

On November 5, 2025, we acquired certain assets of Hydrotex Holdings, Inc. (“Hydrotex”), based in Dallas, Texas for an aggregate purchase price of $17.0 million, comprised of cash considerations of $17.0 million and estimated working capital true-up adjustment of less than $0.1 million. The cash consideration was funded with borrowings under our existing RCF (as defined in Note 9). Hydrotex offers high-performance lubricants designed to enhance operational efficiency, reduce equipment wear, and extend service life that expand upon, and are complementary to our existing general industrial products portfolio. During the year ended March 31, 2026, we incurred $0.5 million in transaction expenses in connection with the Hydrotex acquisition, which were included in selling, general and administrative expenses in the Consolidated Statements of Operations under the Specialized Reliability Solutions segment.

The Hydrotex acquisition was accounted for as a business combination under Topic 805. The excess of the purchase price over the preliminary fair value of the identifiable assets acquired and liabilities assumed was $2.8 million allocated to goodwill, which represents the value expected to be obtained from owning products that are expanding our existing general industrial offerings and provide additional drain lubricant solutions to our customers. The preliminary allocation of the fair value of the net assets acquired comprises customer lists ($7.6 million), trade name ($1.3 million), accounts receivable ($1.6 million), inventory ($3.5 million), other current assets ($0.1 million), and equipment ($0.9 million), net of current liabilities ($0.7 million). Customer lists are being amortized over 15 years, while the trade name and goodwill are not being amortized. The Company’s evaluation of the facts and circumstances available as of November 5, 2025 to assign fair values to assets acquired is ongoing. The primary area of preliminary purchase price allocation subject to change relates to the valuation of working capital and equipment. We expect to finalize the purchase price allocation as soon as practicable, but no later than one year from the acquisition date. The goodwill and intangible assets tax bases are $2.8 million and $8.9 million, respectively, and are deductible and amortized over 15 years. Hydrotex activity has been included in our Specialized Reliability Solutions segment since the acquisition date.

The disclosure of Hydrotex' post-acquisition revenue and net income is not practical due to integration activities since the acquisition date. No pro forma information has been provided due to immateriality.

PF WaterWorks, L.P.

On November 4, 2024, we acquired certain assets of PF WaterWorks, L.P. (“PF WaterWorks”), based in Houston, Texas for an aggregate purchase price of $45.8 million, comprised of cash consideration of $40.0 million, a working capital true-up adjustment of $2.6 million and contingent considerations initially measured at $3.2 million based on PF WaterWorks meeting defined financial targets over a period of 3.2 years. The cash consideration was funded with cash on hand. PF WaterWorks offers innovative, eco-friendly drain management solutions that expand upon, and are complementary to, our existing plumbing product portfolio. As of the acquisition date, the estimated fair value of the contingent consideration was classified as a long-term liability of $3.2 million, which was determined using an option pricing model simulation that determines an average projected payment value across numerous iterations. During the year ended March 31, 2025, we incurred $1.4 million in transaction expenses in connection with the PF WaterWorks acquisition, which were included in selling, general and administrative expenses in the Consolidated Statements of Operations under the Contractor Solutions segment. No transaction expense was incurred during the year ended March 31, 2026.

The PF WaterWorks acquisition was accounted for as a business combination under Topic 805. The excess of the purchase price over the preliminary fair value of the identifiable assets acquired and liabilities assumed was $10.9 million allocated to goodwill, which represents the value expected to be obtained from owning products that are expanding our existing plumbing offerings and provide additional drain management solutions to our customers. The preliminary allocation of the fair value of the net assets acquired comprises customer lists ($26.2 million), trade name ($3.1 million), patent ($0.6 million), accounts receivable ($1.5 million), inventory ($3.8 million), other current assets ($0.2 million) and other assets ($0.4 million), net of current liabilities ($0.7 million) and other liabilities ($0.1 million). Customer lists and patent are being amortized over 15 years and 5 years, respectively, while the trade name and goodwill are not being amortized. During the three months ended December 31, 2025, the Company completed the evaluation of facts and circumstances available as of November 4, 2024, to assign fair values to assets and liabilities acquired. The goodwill and intangible assets tax bases are $10.9 million and $29.9 million, respectively, and are deductible and amortized over 15 years. PF WaterWorks activity has been included in our Contractor Solutions segment since the acquisition date.

The disclosure of PF WaterWorks' post-acquisition revenue and net income is not practical due to integration activities since the acquisition date. No pro forma information has been provided due to immateriality.

PSP Products, Inc.

On August 1, 2024, we acquired the assets of PSP Products, Inc. (“PSP Products”), based in Manassas, Virginia for an aggregate purchase price of $51.3 million, comprised of cash consideration of $32.5 million, a working capital true-up adjustment of $7.0 million and contingent consideration initially measured at $11.8 million based on PSP Products meeting defined operational and financial targets over a period of 2.5 years. The cash consideration was funded with cash on hand and borrowings under our existing RCF (as defined in Note 9). PSP Products offers a family of superior surge protection and load management products to our existing HVAC/R offerings. As of the acquisition date, the estimated fair value of the contingent consideration was classified as a long-term liability of $11.8 million, of which $4.8 million was determined using an option pricing model simulation that determines an average projected payment value across numerous iterations and $7.0 million was determined using a scenario-based analysis on forecasted future results. The fair value of the contingent consideration is evaluated quarterly based on additional information as it becomes available. During the three months ended March 31, 2025, we increased the fair value of the contingent consideration liability related to the PSP Products acquisition due to the better than expected performance and recognized a $2.1 million expense recorded in general and administrative expenses in the Consolidated Statements of Operations under the Contractor Solutions segment. During the three months ended March 31, 2026, the Company remitted a contingent consideration payment of $7.0 million to the former owner of PSP Products upon the satisfaction of the specified performance condition set forth in the purchase agreement. During the year ended March 31, 2025, we incurred $0.5 million in transaction expenses in connection with the PSP Products acquisition, which were included in selling, general and administrative expenses in the Consolidated Statements of Operations under the Contractor Solutions segment.

The PSP Products acquisition was accounted for as a business combination under Topic 805. The excess of the purchase price over the preliminary fair value of the identifiable assets acquired and liabilities assumed was $7.3 million allocated to goodwill, which represents the value expected to be obtained from owning products that are complementary to our existing HVAC/R offerings and provide additional electrical offerings to our customers. The preliminary allocation of the fair value of the net assets acquired comprises customer lists ($30.0 million), trade name ($2.4 million), accounts receivable ($4.4 million),inventory ($8.9 million), other current asset ($0.3 million), equipment ($0.3 million) and other assets ($0.7 million), net of current liabilities ($2.7 million) and other liabilities ($0.3 million). Customer lists are being amortized over 15 years while the trade name and goodwill are not being amortized. During the three months ended September 30, 2025, the Company completed the evaluation of facts and circumstances available as of August 1, 2024, to assign fair values to assets and liabilities acquired. The goodwill and intangible assets tax bases are $7.3 million and $32.4 million, respectively, and are deductible and amortized over 15 years. PSP Products activity has been included in our Contractor Solutions segment since the acquisition date.

The disclosure of PSP Products' post-acquisition revenue and net income is not practical due to integration activities since the acquisition date. No pro forma information has been provided due to immateriality.

Dust Free, LP

On February 6, 2024, we acquired 100% of the outstanding equity of Dust Free, LP ("Dust Free"), based in Royse City, Texas, for an aggregate purchase price of $34.2 million (including $0.6 million cash acquired), comprised of cash consideration of $27.9 million, a final working capital true-up receipt of $0.5 million and contingent considerations initially measured at $6.8 million based on Dust Free meeting defined operational and financial targets over a period of 6 years. The cash consideration was funded with cash on hand and borrowings under our existing RCF (as defined in Note 9). The Dust Free products offer residential and commercial indoor air quality and HVAC/R applications and supplement our Contractor Solutions segment's existing product portfolio. As of the acquisition date, the estimated fair value of the contingent consideration was classified as a long-term liability of $6.8 million, of which $2.1 million was determined using an option pricing model simulation that determines an average projected payment value across numerous iterations and $4.7 million was determined using a scenario-based analysis on forecasted future results. During the three months ended March 31, 2026, the Company remitted a contingent consideration payment of $4.7 million to the former owner of Dust Free upon the satisfaction of the specified performance condition set forth in the purchase agreement. During the year ended March 31, 2024, we incurred $0.7 million in transaction expenses in connection with the Dust Free acquisition, which were included in selling, general and administrative expenses in the Consolidated Statement of Operations under the Contractor Solution segment.

The Dust Free acquisition was accounted for as a business combination under Topic 805. The excess of the purchase price over the preliminary fair value of the identifiable assets acquired was $3.7 million allocated to goodwill, which represents the value expected to be obtained from owning products that are complementary to our existing plumbing offerings and provide a meaningful value proposition to our customers. The preliminary allocation of the fair value of the net assets acquired comprises customer lists ($20.1 million), trademark ($1.6 million), accounts receivable ($2.9 million), cash ($0.6 million), inventory ($4.1 million), other current asset ($0.4 million) and equipment ($3.1 million), net of current liabilities (2.3 million). Customer lists are being amortized over 15 years and the definite-life trademark ($0.6 million) is being amortized over 2 years while the indefinite-life trademark ($1.0 million) and goodwill are not being amortized. During the three months ended March 31, 2025. the Company completed the evaluation of facts and circumstances available as of February 6, 2024, to assign fair values to assets and liabilities acquired. The goodwill and intangible assets tax bases are $3.7 million and $21.7 million, respectively, and are deductible and amortized over 15 years. Dust Free activity has been included in our Contractor Solutions segment since the acquisition date.

The disclosure of Dust Free's post-acquisition revenue and net income is not practical due to integration activities since the acquisition date.

- Definition

The entire disclosure for business combination.

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+ Details

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Cash flow hedging activity, taxes	$ (254)	$ 295	$ (326)
Pension and other postretirement effect, taxes	$ (1)	$ 2	$ (1)

FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Fair Value Disclosures [Abstract]
Long-term investments	$ 7,300	$ 2,500
Contingent consideration	$ 16,700	$ 24,400

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 112,847	$ 137,484	$ 102,539
Other comprehensive income (loss):
Foreign currency translation adjustments	71	(1,883)	(1,947)
Cash flow hedging activity, net of taxes of $(254), $295 and $(326), respectively	955	(1,111)	1,225
Pension and other postretirement effects, net of taxes of $(1), $2 and $(1), respectively	4	(7)	5
Other comprehensive income (loss)	1,030	(3,001)	(717)
Comprehensive income	113,877	134,483	101,822
Less: Comprehensive income attributable to redeemable noncontrolling interest	(802)	(832)	(891)
Comprehensive income attributable to CSW	$ 113,075	$ 133,651	$ 100,931

DETAILS OF CERTAIN CONSOLIDATED BALANCE SHEET CAPTIONS - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid expenses	$ 14,125	$ 11,602
Income taxes receivable	7,731	2,090
Other current assets	3,618	1,458
Current derivative asset	761	0
Short-term tax indemnification assets	320	1,339
Prepaid expenses and other current assets	$ 26,555	$ 16,489

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Current assets:
Cash and cash equivalents	$ 33,799	$ 225,845
Accounts receivable, net	210,264	155,651
Inventories, net	309,707	194,876
Prepaid expenses and other current assets	26,555	16,489
Assets held for sale	8,742	0
Total current assets	589,067	592,861
Property, plant and equipment, net	107,536	93,415
Goodwill	632,631	264,092
Intangible assets, net	900,051	357,910
Other assets	87,399	70,787
Total assets	2,316,684	1,379,065
Current liabilities:
Accounts payable	76,930	54,767
Accrued and other current liabilities	116,055	92,435
Current portion of long-term debt	29,458	0
Liabilities held for sale	4,478	0
Total current liabilities	226,921	147,202
Long-term debt	839,836	0
Retirement benefits payable	1,040	1,083
Other long-term liabilities	179,489	138,347
Total liabilities	1,247,286	286,632
Commitments and contingencies (Note 18)
Redeemable noncontrolling interest	18,989	20,187
Equity:
Common shares, $0.01 par value Shares authorized – 50,000 Shares issued – 17,893 and 17,810, respectively	178	177
Preferred shares, $0.01 par value Shares authorized (10,000) and issued (0)	0	0
Additional paid-in capital	520,076	501,286
Treasury shares, at cost (1,544 and 1,027 shares, respectively)	(257,704)	(122,125)
Retained earnings	798,956	705,035
Accumulated other comprehensive loss	(11,097)	(12,127)
Total equity	1,050,409	1,072,246
Total liabilities and equity	$ 2,316,684	$ 1,379,065

OTHER COMPREHENSIVE INCOME (LOSS)

12 Months Ended

Mar. 31, 2026

Equity [Abstract]

OTHER COMPREHENSIVE INCOME (LOSS)

The following table provides an analysis of the changes in accumulated other comprehensive loss (in thousands).


	March 31,
	2026		2025
Currency translation adjustments:
Balance at beginning of period	$	(12,020)	$	(10,137)
Foreign currency translation adjustments	71		(1,883)
Balance at end of period	$	(11,949)	$	(12,020)
Interest rate swaps:
Balance at beginning of period	$	—	$	1,111
Unrealized gain, net of taxes of $(350) and $153, respectively (a)	1,316		(577)
Reclassification of losses included in interest expense, net of taxes of $96 and $142, respectively	(361)		(534)

Other comprehensive income	955		(1,111)
Balance at end of period	$	955	$	—
Defined benefit plans:
Balance at beginning of period	$	(107)	$	(100)

Amortization of net loss, net of taxes of $(1) and $2, respectively (b)	4		(7)




Other comprehensive income	4		(7)
Balance at end of period	$	(103)	$	(107)

(b) Amortization of actuarial losses out of accumulated other comprehensive loss are included in the computation of net periodic pension expense. See Note 15 for additional information.

RELATED PARTY TRANSACTIONS	12 Months Ended
RELATED PARTY TRANSACTIONS	Mar. 31, 2026
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONSWe had no related party transactions in the three years ended March 31, 2026, 2025 and 2024.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-5

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(e))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/850/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-6

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

+ Details

LONG-TERM DEBT AND COMMITMENTS

12 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

LONG-TERM DEBT AND COMMITMENTS

Debt consists of the following (in thousands):


	March 31,
	2026		2025
Revolving Credit Facility, interest rate of 5.42% (a) and N/A (b)	$	279,000	$	—
Senior Secured Term Loan A, interest rate of 5.29% (a) and N/A (b)	592,500		—
Total debt, gross	871,500		—
Less: Current portion	(29,458)		—
Less: Deferred TLA financing costs, net of amortization	(2,206)		—
Long-term debt	$	839,836	$	—

(a) Represents the interest rate effective on March 31, 2026, including the impact from the interest rate swap discussed in Note 11.

Revolving Credit Facility Agreement

On December 11, 2015, we entered into a five-year $250.0 million Revolving Credit Facility agreement, with an additional $50.0 million accordion feature, with JPMorgan Chase Bank, N.A., as administrative agent, and the other lenders party thereto. The Revolving Credit Facility agreement was subsequently amended on December 1, 2020 ("First Credit Agreement") and May 18, 2021 (the “Second Credit Agreement”). The term "Revolving Credit Facility" (or "RCF") as used throughout this document refers to the First Credit Agreement, the Second Credit Agreement and the Second Amendment, the Third Credit Agreement and the Fourth Credit Agreement, as applicable.

On December 15, 2022, the Company entered into an Incremental Assumption Agreement No. 1 and Amendment No. 2 to the Second Credit Agreement (the “Second Amendment”) to utilize a portion of the accordion feature, thus increasing the commitment to $500.0 million, and concurrently reducing the available incremental accordion to $50.0 million. The Second Amendment also replaced the previously used LIBOR Rate with individualized metrics based on the specific denomination of borrowings, including a metric based on Term SOFR (as defined in the Second Credit Agreement) for borrowings denominated in U.S. Dollars. The Company incurred a total of $0.7 million in underwriting fees, which are being amortized over the remaining term of the RCF.

On May 2, 2025, we entered into a Third Amended and Restated Credit Agreement (the “Third Credit Agreement”) with JPMorgan Chase Bank, N.A., as administrative agent (in such capacity, the “Administrative Agent”) and collateral agent, and the lenders, issuing banks and swingline lender party thereto. The Third Credit Agreement provides for a $700.0 million RCF that contains a $30.0 million sublimit for the issuance of letters of credit and a $15.0 million sublimit for swingline loans, with an additional $250.0 million accordion feature. The Third Credit Agreement is scheduled to mature on May 2, 2030. The Company incurred a total of $2.7 million in financing fees, including underwriting fees, which will be amortized over the life of the Third Credit Agreement. Borrowings under the Third Credit Agreement bear interest at either base rate plus between 0.25% to 1.5% or the adjusted term SOFR rate plus between 1.25% to 2.5%, based on the Company’s leverage ratio calculated on a quarterly basis. The base rate is described in the Third Credit Agreement as the highest of (i) the Federal Reserve Bank of New York effective rate plus 0.5%, (ii) the prime rate quoted by The Wall Street Journal, and (iii) the one-month adjusted term SOFR rate plus 1.0%. We pay a commitment fee between 0.15% to 0.4% based on the Company's leverage ratio for the unutilized portion of this facility. Interest and commitment fees are payable monthly and quarterly, respectively, and the outstanding principal balance is due at the maturity date. The Third Credit Agreement is secured by a first priority lien on substantially all tangible and intangible assets and stock issued by the Company and its material domestic subsidiaries, subject to specified exceptions, and 65% of the voting equity interests in its first-tier foreign subsidiaries.

On November 4, 2025, we entered into a Fourth Amended and Restated Credit agreement (the "Fourth Credit Agreement") with JPMorgan Chase Bank, N.A., as administrative agent (in such capacity, the “Administrative Agent”) and collateral agent, and the lenders, issuing banks and swingline lender party thereto. The Fourth Credit Agreement, among other things, provides for: (i) the continuation of the existing RCF in the aggregate principal committed amount of up to $700.0 million; (ii) the extension of the maturity date of the RCF until November 4, 2030; and (iii) the establishment of a new senior secured term loan “A” credit facility (the “TLA”) in an aggregate principal amount of $600.0 million, and having a maturity date of November 4, 2030.

During the year ended March 31, 2026, we borrowed $505.7 million and repaid $226.7 million under the RCF. As of March 31, 2026 and 2025, we had $279.0 million and $0.0 million, respectively, in our outstanding balance, which resulted in borrowing capacity under the RCF (net of credit utilization) of $419.7 million and $498.7 million, respectively. The financial covenants contained in the RCF require the maintenance of a maximum leverage ratio of 3.50 to 1.00, subject to a temporary increase to 4.00 to 1.00 for 18 months following the consummation of permitted acquisitions with consideration in excess of certain threshold amounts set forth in the RCF. The RCF Agreement also requires the maintenance of a minimum interest coverage ratio of 3.00 to 1.00, the calculations and terms of which are defined in the RCF Agreement. Covenant compliance is tested quarterly, and we were in compliance with all covenants as of March 31, 2026.

Senior Secured Term Loan A

On November 4, 2025, we entered into the Fourth Credit Agreement, as aforementioned, which established the TLA to finance a portion of the purchase price of the MARS Parts acquisition (including payment of related fees, premiums, expenses and other transaction costs) as discussed in Note 2. The Company incurred a total of $2.4 million in financing fees, including underwriting fees, which will be amortized over the life of the Fourth Credit Agreement. The deferred financing fees are recorded in our consolidated balance sheets in long-term debt and the current portion of long-term debt. The TLA amortizes in equal quarterly installments of 1.25% of the initial aggregate principal amount of the TLA or $7.5 million, with the total outstanding balance due in full on maturity of November 4, 2030. Borrowings under the TLA bear interest at either base rate plus between 0.25% to 1.5% or the adjusted term SOFR rate plus between 1.25% to 2.5%, based on the Company’s leverage ratio calculated on a quarterly basis. As of March 31, 2026, the TLA had $592.5 million in principal amount outstanding.

Interest payments on the first $300.0 million borrowing under the TLA are hedged under an interest rate swap agreement as described in Note 11.

Future Minimum Debt Payments

Future minimum debt payments are as follows for years ending March 31 (in thousands):


2027	$	30,000
2028	30,000
2029	30,000
2030	30,000
2031	751,500
Total	$	871,500

CONTINGENCIES	12 Months Ended
CONTINGENCIES	Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
CONTINGENCIES	CONTINGENCIES From time to time, we are involved in various claims and legal actions which arise in the ordinary course of business. There are not any matters pending that we currently believe are reasonably possible of having a material impact on our business, consolidated financial position, results of operations or cash flows. As of March 31, 2026, we were contingently liable in connection with a $1.3 million surety bond associated with our performance under an agreement with a logistics service provider. The letter of credit collateralizing this bond was issued under our RCF (as defined in Note 9) and reduces the available borrowing capacity. We have not recorded any liability for this contingency, as we believe the likelihood of having to perform under the letter of credit is remote.

RETIREMENT PLANS - Assumptions Used To Determine Benefit Obligations And Net Pension Expense (Details)	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Retirement Benefits [Abstract]
Assumptions used to determine benefit obligations: Discount rate	5.70%	5.50%	5.50%
Assumptions used to determine net pension expense: Discount rate	5.50%	5.50%	5.40%

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Revenues, net	$ 1,082,549	$ 878,301	$ 792,840
Cost of revenues	(628,867)	(484,989)	(442,095)
Gross profit	453,682	393,312	350,745
Selling, general and administrative expenses	(269,520)	(212,064)	(190,119)
Impairment expense	(15,627)	0	(1,508)
Operating income	168,535	181,248	159,118
Interest expense, net	(22,245)	(269)	(12,723)
Other expense, net	(737)	(862)	(5,915)
Income before income taxes	145,553	180,117	140,480
Provision for income taxes	(32,706)	(42,633)	(37,941)
Net income	112,847	137,484	102,539
Income attributable to redeemable noncontrolling interest	(802)	(832)	(891)
Net income attributable to CSW	$ 112,045	$ 136,652	$ 101,648
Net income per share attributable to CSW
Basic (in USD per share)	$ 6.73	$ 8.41	$ 6.54
Diluted (in USD per share)	$ 6.70	$ 8.38	$ 6.52
Weighted average number of shares outstanding:
Basic (in shares)	16,653	16,242	15,533
Diluted (in shares)	16,712	16,314	15,581

LONG-TERM DEBT AND COMMITMENTS - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Debt Instrument [Line Items]
Total debt, gross	$ 871,500	$ 0
Less: Current portion	(29,458)	0
Less: Deferred TLA financing costs, net of amortization	(2,206)	0
Long-term debt	$ 839,836	0
Senior Secured Term Loan A \| Senior Notes
Debt Instrument [Line Items]
Interest rate	5.29%
Total debt, gross	$ 592,500	0
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Interest rate	5.42%
Total debt, gross	$ 279,000	$ 0

LEASES - Other Information for Operating Leases (Details)	Mar. 31, 2026	Mar. 31, 2025
Leases [Abstract]
Weighted average remaining lease term (in years)	6 years 3 months 18 days	7 years
Weighted average discount rate (percent)	5.80%	5.60%

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Cybersecurity Risk Management and Strategy Disclosure	Mar. 31, 2026
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Securing our business information, customer and employee data, and IT systems is an important part of our Enterprise Risk Management program. To identify and manage the material risks of cybersecurity threats to our business, operations and control environments, we have established an information security framework, with a focus on cybersecurity incident prevention and mitigation, to help safeguard the confidentiality, integrity, and access of our information assets and to ensure regulatory, contractual, and operational compliance. Our cybersecurity program is integrated into our Enterprise Risk Management program and is managed by a dedicated cybersecurity team that is responsible for leading enterprise-wide cybersecurity strategy, policy, standards, architecture, and processes. The program is aligned with industry standards and best practices, such as the National Institute of Standards and Technology Cybersecurity Framework. As part of our cybersecurity process, we engage external experts and consultants to assess our cybersecurity program effectiveness and compliance with applicable practices and standards. The Company mitigates risks from cybersecurity incidents using a multifaceted approach that includes, but is not limited to: establishing information security policies, implementing information protection processes and technologies, assessing cybersecurity risk and vulnerability, implementing cybersecurity training, monitoring our information technology assets, applications and users, and managing vendors and service providers for third-party risk management. The Company is currently in material compliance with relevant information privacy and cybersecurity governmental standards with which it is required to comply. The Company did not experience a material cybersecurity incident during the year ended March 31, 2026. For more information on how material cybersecurity incidents may impact our business, see Part I, Item 1A. "Risk Factors" of this Form 10-K.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Our cybersecurity program is integrated into our Enterprise Risk Management program and is managed by a dedicated cybersecurity team that is responsible for leading enterprise-wide cybersecurity strategy, policy, standards, architecture, and processes.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Our Board of Directors oversees cybersecurity risk and strategy, and the Audit Committee of the Board of Directors oversees information security compliance as part of its broader compliance oversight mandate. Together, this ensures that the Board of Directors has a comprehensive view of the Company’s cybersecurity risk profile and framework.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Company’s Head of Information Technology, in coordination with the Company’s Chief Financial Officer, General Counsel, Chief Accounting Officer and other internal stakeholders, is responsible for leading the team responsible for assessing, identifying, and managing cybersecurity risks, including implementation of our cybersecurity risk management program.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	Our Board of Directors oversees cybersecurity risk and strategy, and the Audit Committee of the Board of Directors oversees information security compliance as part of its broader compliance oversight mandate.
Cybersecurity Risk Role of Management [Text Block]	The Company’s Head of Information Technology, in coordination with the Company’s Chief Financial Officer, General Counsel, Chief Accounting Officer and other internal stakeholders, is responsible for leading the team responsible for assessing, identifying, and managing cybersecurity risks, including implementation of our cybersecurity risk management program. Our head of Information Technology has extensive experience in cybersecurity risk management and, along with the cybersecurity risk management team, has subject matter expertise in varied topics including data integrity, IT risk, enterprise architecture, third-party risk, threat intelligence, incident response, and regulatory compliance. Our Board of Directors oversees cybersecurity risk and strategy, and the Audit Committee of the Board of Directors oversees information security compliance as part of its broader compliance oversight mandate. Together, this ensures that the Board of Directors has a comprehensive view of the Company’s cybersecurity risk profile and framework. Senior officers of the Company regularly receive briefings on cybersecurity matters, who in turn regularly report to the Board of Directors and its committees on such matters. The Board of Directors receives cybersecurity updates from senior management, including our head of Information Technology, at least twice per year, and the Audit Committee receives quarterly reports on any notable incidents or control issues that may have occurred during the quarter. The Company’s Chief Executive Officer and other senior officers are responsible for the ongoing assessment and management of the risks the Company faces. These enterprise risks (including cybersecurity risks) are formally assessed annually by management as part of the Company's robust Enterprise Risk Management program. At least annually, the Board of Directors, as a whole and through its committees, oversees the Company’s risk profile and management’s policies and processes for assessing and managing risk.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The Company’s Chief Executive Officer and other senior officers are responsible for the ongoing assessment and management of the risks the Company faces. These enterprise risks (including cybersecurity risks) are formally assessed annually by management as part of the Company's robust Enterprise Risk Management program. At least annually, the Board of Directors, as a whole and through its committees, oversees the Company’s risk profile and management’s policies and processes for assessing and managing risk.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Our head of Information Technology has extensive experience in cybersecurity risk management and, along with the cybersecurity risk management team, has subject matter expertise in varied topics including data integrity, IT risk, enterprise architecture, third-party risk, threat intelligence, incident response, and regulatory compliance.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	Senior officers of the Company regularly receive briefings on cybersecurity matters, who in turn regularly report to the Board of Directors and its committees on such matters. The Board of Directors receives cybersecurity updates from senior management, including our head of Information Technology, at least twice per year, and the Audit Committee receives quarterly reports on any notable incidents or control issues that may have occurred during the quarter.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

DETAILS OF CERTAIN CONSOLIDATED BALANCE SHEET CAPTIONS - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 212,578	$ 156,788
Less: Allowance for credit losses	(2,314)	(1,137)
Accounts receivable, net	210,264	155,651	$ 142,700
Accounts receivable trade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	209,267	151,646
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 3,311	$ 5,142

ACQUISITIONS - Schedule of Aggregate Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		5 Months Ended	11 Months Ended
	May 01, 2025	Mar. 31, 2026	Mar. 31, 2026	Nov. 04, 2025	Mar. 31, 2025	Mar. 31, 2024
Business Combination [Line Items]
Other Long-Term Liabilities		$ (3,600)	$ (3,600)
Goodwill		632,631	632,631		$ 264,092	$ 247,191
MARS
Business Combination [Line Items]
Cash		5,973	5,973	$ 5,973
Accounts Receivable		16,315	16,315	16,296
Measurement period adjustments, accounts receivable, net		19
Inventory		52,353	52,353	54,520
Measurement period adjustments, inventory		(2,167)
Income Tax Receivable		2,962	2,962	1,934
Measurement period adjustments, income tax receivable		1,028
Other Current Assets		1,096	1,096	1,606
Measurement period adjustments, income tax receivable, other current assets		(510)
Property, Plant and Equipment		6,644	6,644	6,644
Customer Lists				142,500
Right-Of-Use Assets		5,205	5,205	5,205
Other Long-Term Assets		635	635	635
Measurement period adjustments, other long-term assets		0
Accounts Payable		(9,327)	(9,327)	(7,645)
Measurement period adjustments, accounts payable		(1,682)
Accrued and Other Current Liabilities		(10,498)	(10,498)	(10,729)
Measurement period adjustments, accrued and other current liabilities		231
Lease Liabilities - Short-Term		(1,341)	(1,341)	(1,341)
Deferred Tax Liabilities		(50,633)	(50,633)	(60,679)
Measurement period adjustments, deferred tax liabilities		10,046
Lease Liabilities - Long-Term		(3,864)	(3,864)	(3,864)
Estimated fair value of net assets acquired		406,520	406,520	402,555
Measurement period adjustments, estimated fair value of net assets acquired		3,965
Goodwill		251,616	251,616	264,981
Measurement period, goodwill		(13,365)
Total Purchase Price		658,136	658,136	667,536
Measurement Period, Total Purchase Price		(9,400)
MARS \| Trade Names
Business Combination [Line Items]
Trade Name (indefinite life)		37,000	37,000	45,000
Measurement period adjustments, income tax receivable, trade name (indefinite life)		(8,000)
MARS \| Customer Lists
Business Combination [Line Items]
Customer Lists		354,000	354,000	$ 349,000
Measurement period adjustments, income tax receivable, customer lists (useful life)		5,000
Assets acquired, amortization period	15 years
Aspen Manufacturing acquisition
Business Combination [Line Items]
Cash	$ 2,289	2,289	2,289
Accounts Receivable	15,253	15,191	15,191
Measurement period adjustments, accounts receivable, net			(62)
Inventory	30,851	31,161	31,161
Measurement period adjustments, inventory			310
Other Current Assets	150	150	150
Property, Plant and Equipment	7,916	7,916	7,916
Trade Name (indefinite life)		22,000	22,000
Customer Lists	187,000	165,000	165,000
Right-Of-Use Assets	11,855	11,855	11,855
Long-Term Indemnity Asset	400	972	972
Measurement period adjustments, long-term indemnity asset			572
Deferred Tax Assets	0	1,532	1,532
Measurement period adjustments, deferred tax assets			1,532
Accounts Payable	(5,459)	(5,459)	(5,459)
Accrued and Other Current Liabilities	(8,943)	(9,100)	(9,100)
Measurement period adjustments, accrued and other current liabilities			(157)
Lease Liabilities - Short-Term	(1,019)	(1,019)	(1,019)
Contingency Reserve	(400)	(972)	(972)
Measurement period adjustments, contingency reserve			572
Lease Liabilities - Long-Term	(10,836)	(10,836)	(10,836)
Other Long-Term Liabilities	(3,600)
Estimated fair value of net assets acquired	225,457	227,080	227,080
Measurement period adjustments, estimated fair value of net assets acquired			1,624
Goodwill	100,421	100,493	100,493
Measurement period, goodwill			72
Total Purchase Price	$ 325,878	$ 327,573	327,573
Measurement Period, Total Purchase Price			$ 1,696
Assets acquired, amortization period	15 years
Aspen Manufacturing acquisition \| Trade Names
Business Combination [Line Items]
Trade Name (indefinite life)	$ 22,000
Aspen Manufacturing acquisition \| Customer Lists
Business Combination [Line Items]
Customer Lists	$ 165,000
Assets acquired, amortization period	15 years

INCOME TAXES - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Mar. 31, 2021	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Oct. 31, 2022	Dec. 15, 2020
Effective Income Tax Rate Reconciliation [Line Items]
Effective tax rate				22.50%	23.70%	27.00%
State and local income taxes				$ 5,544	$ 6,325	$ 6,358
Increase in effective tax rate due to state tax expense impact (net of federal benefits)				3.80%	3.50%	4.50%
Effective income tax rate reconciliation, nondeductible executive compensation				$ 1,700	$ 2,100
Effective income tax rate reconciliation, nondeductible executive compensation, percent				1.20%	1.10%
Foreign tax effects				$ 1,200
Effective income tax rate reconciliation, repatriation tax rate differential, percent				0.80%
Effective income tax rate reconciliation, UTP release offset				$ 6,400	$ 3,600
Effective income tax rate reconciliation, amount of additional penalties and interest				$ 1,000	1,300
Effective income tax rate reconciliation, amount of additional penalties and interest percent				(3.60%)
Changes in unrecognized tax benefits ("UTP")				$ (5,229)	$ (2,288)	$ 59
Changes in unrecognized tax benefits ("UTP")				(3.60%)	(1.30%)	0.00%
Effective tax reconciliation, share-based payment arrangement, amount					$ (1,400)
Share-based payment arrangement, percent					(0.80%)
Effective income tax rate reconciliation, FDII					$ (1,200)
Foreign-derived intangible income					(0.70%)
Unrecognized tax benefits				$ 4,483	$ 8,396	$ 10,877
Tax contingency reserves				1,100
Decrease in unrecognized tax benefits is reasonably possible				6,400
Canada
Effective Income Tax Rate Reconciliation [Line Items]
Foreign tax effects				$ 1,722	$ 607	$ 1,119
Effective income tax rate reconciliation, repatriation tax rate differential, percent				1.20%	0.30%	0.80%
Falcon Stainless, Inc.
Effective Income Tax Rate Reconciliation [Line Items]
Unrecognized tax benefits				$ 600			$ 3,000
Interest accrued					$ 1,200
Penalties accrued					200
Tax contingency reserves				100
Indemnification assets, range of outcomes, value, high							4,500
Indemnification assets, amount as of acquisition date							$ 3,000
Indemnification assets, release in period	$ 1,400	$ 900
Aspen Manufacturing acquisition
Effective Income Tax Rate Reconciliation [Line Items]
Tax contingency reserves				1,000
T.A. Industries, Inc.
Effective Income Tax Rate Reconciliation [Line Items]
Unrecognized tax benefits					3,600
Interest accrued					600
Penalties accrued					$ 500
Tax contingency reserves				8,600				$ 17,300
Indemnification assets, range of outcomes, value, high								12,500
Indemnification assets, amount as of acquisition date								$ 12,500
Indemnification assets, release in period			$ 5,000
Tax indemnification asset release	$ 5,000	$ 2,700
Lapse Of Statute
Effective Income Tax Rate Reconciliation [Line Items]
Unrecognized tax benefits				6,400
Interest accrued				1,500
Penalties accrued				1,000
Historical Positions
Effective Income Tax Rate Reconciliation [Line Items]
Interest accrued				900
Penalties accrued				$ 100

INVENTORY - Schedule of Inventories, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 119,622	$ 54,761
Work in process	4,823	5,969
Finished goods	200,700	144,897
Total inventories	325,145	205,627
Less: Obsolescence reserve	(15,438)	(10,751)
Inventories, net	$ 309,707	$ 194,876

OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,072,246	$ 615,723	$ 525,675
Foreign currency translation adjustments	1,030	(3,001)	(717)
Other comprehensive income	113,877	134,483	101,822
Balance at end of period	1,050,409	1,072,246	615,723
Currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(12,020)	(10,137)
Foreign currency translation adjustments	71	(1,883)
Balance at end of period	(11,949)	(12,020)	(10,137)
Interest rate swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	0	1,111
Unrealized gains, net of taxes	1,316	(577)
Reclassification of losses included in interest expense, net of taxes	(361)	(534)
Other comprehensive income	955	(1,111)
Balance at end of period	955	0	1,111
Interest rate swaps, unrealized gain, tax	(350)	153
Reclassification from AOCI, tax	96	142
Defined benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(107)	(100)
Other comprehensive income	4	(7)
Balance at end of period	(103)	(107)	$ (100)
Expected loss (less than)	(600)
Amortization of net loss, net of taxes
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification of losses included in interest expense, net of taxes	4	(7)
Reclassification from AOCI, tax	$ (1)	$ 2

DERIVATIVE INSTRUMENTS AND HEDGE ACCOUNTING - Narrative (Details) - Interest rate swap - USD ($) $ in Millions	1 Months Ended
	Sep. 30, 2024	Mar. 31, 2026	Nov. 04, 2025	Mar. 31, 2025	Feb. 07, 2023
Derivative [Line Items]
Amount of hedged item		$ 300.0	$ 300.0		$ 100.0
Derivative, fixed interest rate			3.42%		3.85%
Payment for hedge	$ 0.4
Notional amount		$ 300.0		$ 300.0
Maximum remaining length of interest rate swap contract		2 years 7 months 6 days

RETIREMENT PLANS - Summary The Expected Cash Benefit Payments For The Plans (Details) $ in Thousands	Mar. 31, 2026 USD ($)
Retirement Benefits [Abstract]
2027	$ 100
2028	100
2029	100
2030	100
2031	100
Thereafter	$ 500

RETIREMENT PLANS - Summary Of Amounts Recognized In The Balance Sheets Plans (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Retirement Benefits [Abstract]
Current liabilities	$ (106)	$ (103)
Noncurrent liabilities	(1,040)	(1,083)
Unfunded status	$ (1,146)	$ (1,186)

INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Deferred tax assets:
Operating lease liabilities	$ 17,603	$ 16,461
Accrued compensation	7,390	6,197
Pension and other employee benefits	1,563	554
Inventory reserves	8,103	4,938
Accrued expenses	4,530	823
Credits and carryforwards	1,222	441
Capitalized R&D	0	1,859
Transaction Costs	2,563	1,863
Other, net	2,186	1,067
Deferred tax assets	45,160	34,203
Valuation allowance	(459)	(444)
Deferred tax assets, net of valuation allowance	44,701	33,759
Deferred tax liabilities:
Goodwill and intangible assets	(110,463)	(60,979)
Property, plant and equipment	(9,687)	(7,462)
Operating lease right-of-use assets	(15,931)	(14,681)
Repatriation reserve	(2,345)	(2,079)
Other, net	(3,600)	(896)
Deferred tax liabilities	(142,026)	(86,097)
Net deferred tax liabilities	$ (97,325)	$ (52,338)

EARNINGS PER SHARE

12 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

EARNINGS PER SHARE

The following table sets forth the reconciliation of the numerator and the denominator of basic and diluted earnings per share for the years ended March 31, 2026, 2025 and 2024:


	Year Ended March 31,
	2026		2025		2024
Net income	$	112,847	$	137,484	$	102,539

Income attributable to redeemable noncontrolling interest	(802)		(832)		(891)
Net income attributable to CSW	$	112,045	$	136,652	$	101,648
Weighted average shares:
Common stock	16,570		16,148		15,427
Participating securities	83		94		106
Denominator for basic earnings per common share	16,653		16,242		15,533
Potentially dilutive securities	59		72		48
Denominator for diluted earnings per common share	16,712		16,314		15,581

Net income per share attributable to CSW:
Basic	$	6.73	$	8.41	$	6.54
Diluted	$	6.70	$	8.38	$	6.52

REVENUE RECOGNITION - Schedule of Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Change in Contract Liabilities [Roll Forward]
Balance at beginning of the year	$ 932	$ 548
Balance at beginning of the year	(818)	(436)
New contracts and revenue added to existing contracts	1,430	820
Ending balance	$ 1,544	$ 932