CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Income Statement [Abstract]
Net sales	$ 473,884	$ 424,010	$ 906,849	$ 790,202
Cost of goods sold	305,544	275,626	584,082	511,684
Gross profit	168,340	148,384	322,767	278,518
Selling, general and administrative expenses	141,483	131,609	278,516	254,050
Depreciation and amortization	5,914	4,955	11,601	9,181
Operating profit	20,943	11,820	32,650	15,287
Interest and financing charges, net	1,177	2,290	2,153	4,000
Income before income taxes	19,766	9,530	30,497	11,287
Income tax expense	7,313	3,622	11,284	4,289
Net income	$ 12,453	5,908	$ 19,213	6,998
Add: Loss attributable to noncontrolling interest		328		528
Income attributable to G-III	$ 12,453	$ 6,236	$ 19,213	$ 7,526
Basic:
Net income per common share (in dollars per share)	$ 0.28	$ 0.15	$ 0.43	$ 0.18
Weighted average number of shares outstanding (in shares)	45,073	42,374	45,020	41,686
Diluted:
Net income per common share (in dollars per share)	$ 0.27	$ 0.14	$ 0.42	$ 0.18
Weighted average number of shares outstanding (in shares)	46,362	43,320	46,289	42,692
Net income attributable to G-III	$ 12,453	$ 6,236	$ 19,213	$ 7,526
Other comprehensive income (loss):
Foreign currency translation adjustments	1,117	(293)	(10,007)	(329)
Other comprehensive income (loss)	1,117	(293)	(10,007)	(329)
Comprehensive income	$ 13,570	$ 5,943	$ 9,206	$ 7,197