v3.25.3
NET INCOME PER COMMON SHARE - Reconciliation between basic and diluted net income per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2025
Oct. 31, 2024
NET INCOME PER COMMON SHARE        
Net income (loss) attributable to G-III Apparel Group, Ltd. $ 80,593 $ 114,768 $ 99,291 $ 144,782
Basic net income (loss) per share:        
Basic common shares 42,254 43,885 42,917 44,640
Basic net income per share (in dollars per share) $ 1.91 $ 2.62 $ 2.31 $ 3.24
Diluted net income (loss) per share:        
Basic common shares 42,254 43,885 42,917 44,640
Dilutive restricted stock unit awards and stock options 1,644 1,069 1,612 1,079
Diluted common shares 43,898 44,954 44,529 45,719
Diluted net income per share (in dollars per share) $ 1.84 $ 2.55 $ 2.23 $ 3.17