CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Income Statement [Abstract]
Net sales	$ 909,865	$ 812,330	$ 1,816,714	$ 1,602,532
Cost of goods sold	572,808	517,078	1,156,890	1,028,762
Gross profit	337,057	295,252	659,824	573,770
Selling, general and administrative expenses	191,044	176,383	469,560	430,433
Depreciation and amortization	6,611	5,589	18,213	14,770
Operating profit	139,402	113,280	172,051	128,567
Other income	896	11,950	896	11,950
Interest and financing charges, net	(1,955)	(1,988)	(4,107)	(5,988)
Income before income taxes	138,343	123,242	168,840	134,529
Income tax expense	51,187	43,469	62,471	47,758
Net income	87,156	79,773	106,369	86,771
Add: Loss attributable to noncontrolling interest		842		1,370
Income attributable to G-III	$ 87,156	$ 80,615	$ 106,369	$ 88,141
Basic:
Net income per common share (in dollars per share)	$ 1.92	$ 1.80	$ 2.36	$ 2.06
Weighted average number of shares outstanding (in shares)	45,311	44,822	45,117	42,740
Diluted:
Net income per common share (in dollars per share)	$ 1.87	$ 1.76	$ 2.29	$ 2.02
Weighted average number of shares outstanding (in shares)	46,526	45,724	46,392	43,682
Net income attributable to G-III	$ 87,156	$ 80,615	$ 106,369	$ 88,141
Other comprehensive income (loss):
Foreign currency translation adjustments	929	(7,805)	(9,078)	(8,134)
Other comprehensive income (loss)	929	(7,805)	(9,078)	(8,134)
Comprehensive income	$ 88,085	$ 72,810	$ 97,291	$ 80,007