v3.25.1
EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]      
Net income $ 137,484 $ 102,539 $ 96,574
Income attributable to redeemable noncontrolling interest 832 891 139
Net income attributable to CSW Industrials, Inc. $ 136,652 $ 101,648 $ 96,435
Weighted average shares:      
Common stock (in shares) 16,148 15,427 15,401
Participating securities (in shares) 94 106 108
Denominator for basic earnings per common share (in shares) 16,242 15,533 15,509
Potentially dilutive securities (in shares) 72 48 37
Denominator for diluted earnings per common share (in shares) 16,314 15,581 15,546
Basic earnings per common share (in USD per share) $ 8.41 $ 6.54 $ 6.22
Diluted earnings per common share (in USD per share) $ 8.38 $ 6.52 $ 6.20