v3.25.4

REVENUE RECOGNITION - Schedule of Contract Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Change in Contract Liabilities [Roll Forward]
Balance at beginning of period	$ 932	$ 548
Revenue recognized during the period	(723)	(411)
New contracts and revenue added to existing contracts during the period	1,139	588
Balance at end of period	$ 1,348	$ 725

X

- Definition

Change in Contract with Customer, Liability

+ References

No definition available.

+ Details

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Namespace Prefix:	cswi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contract With Customer, Liability, Including New Contract Revenue, Recognized

+ References

No definition available.

+ Details

Name:	cswi_ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized
Namespace Prefix:	cswi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Increase for New Contracts And Revenue Added To Existing Contracts

+ References

No definition available.

+ Details

Name:	cswi_ContractWithCustomerLiabilityIncreaseForNewContractsAndRevenueAddedToExistingContracts
Namespace Prefix:	cswi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant