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Reconciliation between Basic and Diluted Net Income per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Accounting Policies [Abstract]                      
Net income attributable to G-III $ 13,055 $ 59,595 $ 3,592 $ 1,118 $ 8,070 $ 48,291 $ 1,362 $ (847) $ 77,360 $ 56,875 $ 49,620
Basic net income per share:                      
Basic common shares                 20,323 20,006 19,796
Basic net income per share $ 0.64 $ 2.92 $ 0.18 $ 0.06 $ 0.40 $ 2.41 $ 0.07 $ (0.04) $ 3.81 $ 2.84 $ 2.51
Diluted net income per share:                      
Basic common shares                 20,323 20,006 19,796
Stock options and restricted stock awards                 541 274 396
Diluted common shares                 20,864 20,280 20,192
Diluted net income per share $ 0.62 $ 2.85 $ 0.17 $ 0.05 $ 0.40 $ 2.37 $ 0.07 $ (0.04) $ 3.71 $ 2.80 $ 2.46