Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]
Net sales	$ 543,513	$ 510,009	$ 1,024,441	$ 936,855
Cost of goods sold	353,306	347,734	690,702	649,554
Gross profit	190,207	162,275	333,739	287,301
Selling, general and administrative expenses	106,287	86,958	242,355	204,708
Depreciation and amortization	2,811	1,875	6,964	5,251
Operating profit (loss)	81,109	73,442	84,420	77,342
Equity loss in joint venture	273	337	706	812
Interest and financing charges, net	3,073	2,297	5,211	4,009
Income before income taxes	77,763	70,808	78,503	72,521
Income tax expense	29,550	27,253	29,831	27,921
Net income	48,213	43,555	48,672	44,600
Add: Loss attributable to noncontrolling interest	78		133
Income attributable to G-III	48,291	43,555	48,805	44,600
Basic:
Net income per common share	$ 2.41	$ 2.19	$ 2.44	$ 2.25
Weighted average number of shares outstanding	20,053	19,845	19,971	19,804
Diluted:
Net income per common share	$ 2.37	$ 2.16	$ 2.40	$ 2.21
Weighted average number of shares outstanding	20,401	20,172	20,309	20,209
Net income attributable to G-lll	48,291	43,555	48,805	44,600
Other comprehensive income (loss):
Foreign currency translation adjustments	3,608	(44)	3,553	(78)
Other comprehensive income (loss)	3,608	(44)	3,553	(78)
Comprehensive income	$ 51,899	$ 43,511	$ 52,358	$ 44,522