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Quarterly Financial Data (Unaudited) (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
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 472,756 $ 668,702 $ 304,158 $ 272,615 $ 375,278 $ 543,513 $ 251,479 $ 229,449 $ 1,718,231 $ 1,399,719 $ 1,231,201
Gross profit 166,520 227,302 99,419 92,392 117,897 190,207 74,843 68,690 585,633 451,637 370,716
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
Net income/(loss) per common share                      
Basic (in dollars 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 (in dollars per share) $ 0.62 $ 2.85 $ 0.17 $ 0.05 $ 0.40 $ 2.37 $ 0.07 $ (0.04) $ 3.71 $ 2.80 $ 2.46