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Net Income per Common Share - Reconciliation between basic and diluted net income per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Earnings Per Share [Abstract]        
Net income attributable to G-III $ 12,453 $ 6,236 $ 19,213 $ 7,526
Basic net income per share:        
Basic common shares 45,073 42,374 45,020 41,686
Basic net income per share (in dollars per share) $ 0.28 $ 0.15 $ 0.43 $ 0.18
Diluted net income per share:        
Basic common shares 45,073 42,374 45,020 41,686
Restricted stock awards and stock options 1,289 946 1,269 1,006
Diluted common shares 46,362 43,320 46,289 42,692
Diluted net income per share (in dollars per share) $ 0.27 $ 0.14 $ 0.42 $ 0.18