v3.24.1.1.u2
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
May 20, 2024
Sep. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2024    
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 CSWI    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
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     $ 2,686.9
Entity Common Stock, Shares Outstanding   15,527,723  
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 2024    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001624794