CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Income Statement [Abstract]
Net sales	$ 812,330	$ 668,702	$ 1,602,532	$ 1,245,476
Cost of goods sold	517,078	441,757	1,028,762	826,654
Gross profit	295,252	226,945	573,770	418,822
Selling, general and administrative expenses	176,383	125,457	430,433	300,329
Depreciation and amortization	5,589	3,158	14,770	9,523
Operating profit	113,280	98,330	128,567	108,970
Other income	11,950		11,950
Interest and financing charges, net	(1,988)	(2,592)	(5,988)	(6,183)
Income before income taxes	123,242	95,738	134,529	102,787
Income tax expense	43,469	36,381	47,758	39,059
Net income	79,773	59,357	86,771	63,728
Add: Loss attributable to noncontrolling interest	842	238	1,370	577
Income attributable to G-III	80,615	59,595	88,141	64,305
Basic:
Net income per common share (in dollars per share)	$ 3.60	$ 2.92	$ 4.12	$ 3.17
Weighted average number of shares outstanding (in shares)	22,411	20,399	21,370	20,290
Diluted:
Net income per common share (in dollars per share)	$ 3.53	$ 2.85	$ 4.04	$ 3.09
Weighted average number of shares outstanding (in shares)	22,862	20,911	21,841	20,818
Net income attributable to G-III	80,615	59,595	88,141	64,305
Other comprehensive income (loss):
Foreign currency translation adjustments	(7,805)	3,761	(8,134)	1,246
Other comprehensive income (loss)	(7,805)	3,761	(8,134)	1,246
Comprehensive income	$ 72,810	$ 63,356	$ 80,007	$ 65,551