CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Income Statement [Abstract]
Net sales	$ 2,386,435	$ 2,344,142	$ 2,116,855
Cost of goods sold	1,545,574	1,505,504	1,359,596
Gross profit	840,861	838,638	757,259
Selling, general and administrative expenses	704,436	628,762	571,990
Depreciation and amortization	32,481	25,392	20,374
Asset impairments	10,480
Operating profit	93,464	184,484	164,895
Other income (loss)	(27)	1,340	11,488
Interest and financing charges, net	(15,675)	(6,691)	(7,942)
Income before income taxes	77,762	179,133	168,441
Income tax expense	25,824	64,800	59,450
Net income	51,938	114,333	108,991
Add: Loss attributable to noncontrolling interest			1,370
Income attributable to G-III	$ 51,938	$ 114,333	$ 110,361
Basic:
Net income per common share (in dollars per share)	$ 1.12	$ 2.52	$ 2.55
Weighted average number of shares outstanding (in shares)	46,308	45,328	43,298
Diluted:
Net income per common share (in dollars per share)	$ 1.10	$ 2.46	$ 2.48
Weighted average number of shares outstanding (in shares)	47,394	46,512	44,424
Net income attributable to G-III	$ 51,938	$ 114,333	$ 110,361
Other comprehensive income (loss):
Foreign currency translation adjustments	(4,033)	(13,584)	(16,270)
Other comprehensive income (loss)	(4,033)	(13,584)	(16,270)
Comprehensive income	$ 47,905	$ 100,749	$ 94,091