CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Income Statement [Abstract]
Net sales	$ 2,116,855	$ 1,718,231	$ 1,399,719
Cost of goods sold	1,359,596	1,133,222	948,392
Gross profit	757,259	585,009	451,327
Selling, general and administrative expenses	571,990	440,506	341,242
Depreciation and amortization	20,374	13,676	9,907
Operating profit	164,895	130,827	100,178
Equity loss in joint venture			(719)
Other income	11,488
Interest and financing charges, net	(7,942)	(8,599)	(7,454)
Income before income taxes	168,441	122,228	92,005
Income tax expense	59,450	45,826	35,436
Net income	108,991	76,402	56,569
Add: Loss attributable to noncontrolling interest	1,370	958	306
Income attributable to G-III	110,361	77,360	56,875
Basic:
Net income per common share (in dollars per share)	$ 5.10	$ 3.81	$ 2.84
Weighted average number of shares outstanding (in shares)	21,649	20,323	20,006
Diluted:
Net income per common share (in dollars per share)	$ 4.97	$ 3.71	$ 2.80
Weighted average number of shares outstanding (in shares)	22,212	20,864	20,280
Net income attributable to G-III	110,361	77,360	56,875
Other comprehensive income:
Foreign currency translation adjustments	(16,270)	2,642	3,519
Other comprehensive income (loss)	(16,270)	2,642	3,519
Comprehensive income	$ 94,091	$ 80,002	$ 60,394