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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, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Computation Of Earnings Per Share Line Items                      
Net income attributable to G-III                 $ 56,875 $ 49,620 $ 56,682
Basic net income per share:                      
Basic common shares                 20,006 19,796 19,175
Basic net income per share $ 0.40 $ 2.41 $ 0.07 $ (0.04) $ 0.25 $ 2.19 $ 0.08 $ (0.03) $ 2.84 $ 2.51 $ 2.96
Diluted net income per share:                      
Basic common shares                 20,006 19,796 19,175
Stock options, stock warrants and restricted stock awards                 274 396 530
Diluted common shares                 20,280 20,192 19,705
Diluted net income per share $ 0.40 $ 2.37 $ 0.07 $ (0.04) $ 0.25 $ 2.16 $ 0.08 $ (0.03) $ 2.80 $ 2.46 $ 2.88