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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, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 514,323us-gaap_SalesRevenueGoodsNet $ 812,330us-gaap_SalesRevenueGoodsNet $ 424,010us-gaap_SalesRevenueGoodsNet $ 366,192us-gaap_SalesRevenueGoodsNet $ 472,756us-gaap_SalesRevenueGoodsNet $ 668,702us-gaap_SalesRevenueGoodsNet $ 304,158us-gaap_SalesRevenueGoodsNet $ 272,615us-gaap_SalesRevenueGoodsNet $ 2,116,855us-gaap_SalesRevenueGoodsNet $ 1,718,231us-gaap_SalesRevenueGoodsNet $ 1,399,719us-gaap_SalesRevenueGoodsNet
Gross profit 183,490us-gaap_GrossProfit 295,252us-gaap_GrossProfit 148,384us-gaap_GrossProfit 130,133us-gaap_GrossProfit 166,187us-gaap_GrossProfit 226,945us-gaap_GrossProfit 99,423us-gaap_GrossProfit 92,453us-gaap_GrossProfit 757,259us-gaap_GrossProfit 585,009us-gaap_GrossProfit 451,327us-gaap_GrossProfit
Net income attributable to G-III $ 22,220us-gaap_NetIncomeLoss $ 80,615us-gaap_NetIncomeLoss $ 6,236us-gaap_NetIncomeLoss $ 1,290us-gaap_NetIncomeLoss $ 13,055us-gaap_NetIncomeLoss $ 59,595us-gaap_NetIncomeLoss $ 3,592us-gaap_NetIncomeLoss $ 1,118us-gaap_NetIncomeLoss $ 110,361us-gaap_NetIncomeLoss $ 77,360us-gaap_NetIncomeLoss $ 56,875us-gaap_NetIncomeLoss
Net income/(loss) per common share                      
Basic (in dollars per share) $ 0.99us-gaap_EarningsPerShareBasic $ 3.60us-gaap_EarningsPerShareBasic $ 0.29us-gaap_EarningsPerShareBasic $ 0.06us-gaap_EarningsPerShareBasic $ 0.64us-gaap_EarningsPerShareBasic $ 2.92us-gaap_EarningsPerShareBasic $ 0.18us-gaap_EarningsPerShareBasic $ 0.06us-gaap_EarningsPerShareBasic $ 5.10us-gaap_EarningsPerShareBasic $ 3.81us-gaap_EarningsPerShareBasic $ 2.84us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 0.96us-gaap_EarningsPerShareDiluted $ 3.53us-gaap_EarningsPerShareDiluted $ 0.29us-gaap_EarningsPerShareDiluted $ 0.06us-gaap_EarningsPerShareDiluted $ 0.62us-gaap_EarningsPerShareDiluted $ 2.85us-gaap_EarningsPerShareDiluted $ 0.17us-gaap_EarningsPerShareDiluted $ 0.05us-gaap_EarningsPerShareDiluted $ 4.97us-gaap_EarningsPerShareDiluted $ 3.71us-gaap_EarningsPerShareDiluted $ 2.80us-gaap_EarningsPerShareDiluted