CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Income Statement [Abstract]
Net sales	$ 483,081	$ 297,212	$ 1,002,991	$ 702,343
Cost of goods sold	290,203	162,519	614,644	443,249
Gross profit	192,878	134,693	388,347	259,094
Selling, general and administrative expenses	146,840	122,102	288,443	276,722
Depreciation and amortization	7,098	9,691	14,142	19,558
Loss on lease modifications		14,302		17,489
Operating profit (loss)	38,940	(11,402)	85,762	(54,675)
Other income (loss)	1,975	1,943	3,795	(113)
Interest and financing charges, net	(12,574)	(9,177)	(24,578)	(19,556)
Income (loss) before income taxes	28,341	(18,636)	64,979	(74,344)
Income tax expense (benefit)	9,235	(3,660)	19,494	(20,073)
Net income (loss)	19,106	(14,976)	45,485	(54,271)
Less: Income attributable to noncontrolling interests	(62)		(4)
Net income (loss) attributable to G-III Apparel Group, Ltd.	$ 19,168	$ (14,976)	$ 45,489	$ (54,271)
Basic:
Net income (loss) per common share	$ 0.40	$ (0.31)	$ 0.94	$ (1.13)
Weighted average number of shares outstanding (in shares)	48,476	48,214	48,427	48,121
Diluted:
Net income per common share	$ 0.39	$ (0.31)	$ 0.92	$ (1.13)
Weighted average number of shares outstanding (in shares)	49,523	48,214	49,502	48,121
Other comprehensive income:
Foreign currency translation adjustments	$ 2,021	$ 3,774	$ (4,938)	$ (252)
Other comprehensive loss	2,021	3,774	(4,938)	(252)
Comprehensive income	21,127	(11,202)	40,547	(54,523)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract]
Net loss	(62)		(4)
Foreign currency translation adjustments	10		6
Comprehensive income attributable to noncontrolling interests	(52)		2
Comprehensive income attributable to G-III Apparel Group, Ltd	$ 21,075	$ (11,202)	$ 40,549	$ (54,523)