CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Common Stock Held In Treasury	Total
Balance at beginning of period at Jan. 31, 2023	$ 264	$ 468,712	$ (11,653)	$ 983,944		$ 1,385,448
Balance at beginning of period, treasury at Jan. 31, 2023					$ (55,819)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards vested, net		(16,108)			16,108
Share-based compensation expense		11,728				11,728
Taxes paid for net share settlements		(10,828)				(10,828)
Other comprehensive (loss) income, net			(4,342)			(4,342)
Repurchases of common stock					(26,100)	(26,100)
Net income attributable to G-III Apparel Group, Ltd.				147,314		147,314
Balance at end of period, treasury at Oct. 31, 2023					(65,811)	(65,811)
Balance at end of period at Oct. 31, 2023	264	453,504	(15,995)	1,131,258		1,503,220
Balance at beginning of period at Jul. 31, 2023	264	448,762	(4,603)	1,003,618		1,382,115
Balance at beginning of period, treasury at Jul. 31, 2023					(65,926)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards vested, net		(115)			115
Share-based compensation expense		4,890				4,890
Taxes paid for net share settlements		(33)				(33)
Other comprehensive (loss) income, net			(11,392)			(11,392)
Net income attributable to G-III Apparel Group, Ltd.				127,640		127,640
Balance at end of period, treasury at Oct. 31, 2023					(65,811)	(65,811)
Balance at end of period at Oct. 31, 2023	264	453,504	(15,995)	1,131,258		1,503,220
Balance at beginning of period at Jan. 31, 2024	264	458,841	(3,207)	1,160,112		1,550,260
Balance at beginning of period, treasury at Jan. 31, 2024					(65,750)	(65,750)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards vested, net		(9,668)			9,668
Share-based compensation expense		17,942				17,942
Taxes paid for net share settlements		(7,534)				(7,534)
Other comprehensive (loss) income, net			6,627			6,627
Repurchases of common stock					(59,973)	(59,973)
Excise tax on stock repurchases					(636)	(636)
Reduction of noncontrolling interest		(2,742)				(2,742)
Net income attributable to G-III Apparel Group, Ltd.				144,782		144,782
Balance at end of period, treasury at Oct. 31, 2024					(116,691)	(116,691)
Balance at end of period at Oct. 31, 2024	264	456,839	3,420	1,304,894		1,648,726
Balance at beginning of period at Jul. 31, 2024	264	451,005	(12,069)	1,190,126		1,512,635
Balance at beginning of period, treasury at Jul. 31, 2024					(116,691)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense		5,834				5,834
Other comprehensive (loss) income, net			15,489			15,489
Net income attributable to G-III Apparel Group, Ltd.				114,768		114,768
Balance at end of period, treasury at Oct. 31, 2024					$ (116,691)	(116,691)
Balance at end of period at Oct. 31, 2024	$ 264	$ 456,839	$ 3,420	$ 1,304,894		$ 1,648,726