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, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Income Statement [Abstract]
Net sales	$ 668,702	$ 543,513	$ 1,245,476	$ 1,024,441
Cost of goods sold	441,400	353,306	826,361	690,702
Gross profit	227,302	190,207	419,115	333,739
Selling, general and administrative expenses	125,457	106,287	300,329	242,355
Depreciation and amortization	3,158	2,811	9,523	6,964
Operating profit	98,687	81,109	109,263	84,420
Equity loss in joint venture		273		706
Interest and financing charges, net	2,949	3,073	6,476	5,211
Income before income taxes	95,738	77,763	102,787	78,503
Income tax expense	36,381	29,550	39,059	29,831
Net income	59,357	48,213	63,728	48,672
Add: Loss attributable to noncontrolling interest	238	78	577	133
Income attributable to G-III	59,595	48,291	64,305	48,805
Basic:
Net income per common share (in dollars per share)	$ 2.92	$ 2.41	$ 3.17	$ 2.44
Weighted average number of shares outstanding (in shares)	20,399	20,053	20,290	19,971
Diluted:
Net income per common share (in dollars per share)	$ 2.85	$ 2.37	$ 3.09	$ 2.40
Weighted average number of shares outstanding (in shares)	20,911	20,401	20,818	20,309
Net income attributable to G-III	59,595	48,291	64,305	48,805
Other comprehensive income:
Foreign currency translation adjustments	3,761	3,608	1,246	3,553
Other comprehensive income	3,761	3,608	1,246	3,553
Comprehensive income	$ 63,356	$ 51,899	$ 65,551	$ 52,358