Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
May 13, 2020
Sep. 30, 2019
Cover [Abstract]   
Document Type10-K  
Document Annual Reporttrue  
Document Period End DateMar. 31, 2020  
Document Transition Reportfalse  
Entity File Number001-37454  
Entity Registrant NameCSW INDUSTRIALS, INC.  
Entity Incorporation, State or Country CodeDE  
Entity Tax Identification Number47-2266942  
Entity Address, Address Line One5420 Lyndon B. Johnson Freeway, Suite 500  
Entity Address, City or TownDallas  
Entity Address, State or ProvinceTX  
Entity Address, Postal Zip Code75240  
City Area Code214  
Local Phone Number884-3777  
Title of 12(b) SecurityCommon Stock, par value $0.01 per share  
Trading SymbolCSWI  
Security Exchange NameNASDAQ  
Entity Well-known Seasoned IssuerNo  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Interactive Data CurrentYes  
Entity Filer CategoryAccelerated Filer  
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
Entity Shell Companyfalse  
Entity Public Float  $ 553.0
Entity Common Stock, Shares Outstanding 14,680,364 
Documents Incorporated by ReferenceCertain information contained in the definitive proxy statement for the registrant’s Annual Meeting of Stockholders is incorporated by reference into Part III hereof.  
Amendment Flagfalse  
Document Fiscal Year Focus2020  
Document Fiscal Period FocusFY  
Entity Central Index Key0001624794  
Current Fiscal Year End Date--03-31  

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