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		(15,993)			15,993
Share-based compensation expense		6,838				6,838
Taxes paid for net share settlements		(10,795)				(10,795)
Other comprehensive (loss) income, net			7,050			7,050
Repurchases of common stock					(26,100)	(26,100)
Net income attributable to G-III Apparel Group, Ltd.				19,674		19,674
Balance at end of period, treasury at Jul. 31, 2023					(65,926)	(65,926)
Balance at end of period at Jul. 31, 2023	264	448,762	(4,603)	1,003,618		1,382,115
Balance at beginning of period at Apr. 30, 2023	264	472,474	(6,936)	987,180		1,380,447
Balance at beginning of period, treasury at Apr. 30, 2023					(72,535)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards vested, net		(15,940)			15,940
Share-based compensation expense		3,001				3,001
Taxes paid for net share settlements		(10,773)				(10,773)
Other comprehensive (loss) income, net			2,333			2,333
Repurchases of common stock					(9,331)	(9,331)
Net income attributable to G-III Apparel Group, Ltd.				16,438		16,438
Balance at end of period, treasury at Jul. 31, 2023					(65,926)	(65,926)
Balance at end of period at Jul. 31, 2023	264	448,762	(4,603)	1,003,618		1,382,115
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		12,108				12,108
Taxes paid for net share settlements		(7,534)				(7,534)
Other comprehensive (loss) income, net			(8,862)			(8,862)
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.				30,014		30,014
Balance at end of period, treasury at Jul. 31, 2024					(116,691)	(116,691)
Balance at end of period at Jul. 31, 2024	264	451,005	(12,069)	1,190,126		1,512,635
Balance at beginning of period at Apr. 30, 2024	264	450,844	(10,090)	1,165,914		1,519,875
Balance at beginning of period, treasury at Apr. 30, 2024					(87,057)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards vested, net		(2,625)			2,625
Share-based compensation expense		5,528				5,528
Other comprehensive (loss) income, net			(1,979)			(1,979)
Repurchases of common stock					(31,623)	(31,623)
Excise tax on stock repurchases					(636)	(636)
Reduction of noncontrolling interest		(2,742)				(2,742)
Net income attributable to G-III Apparel Group, Ltd.				24,212		24,212
Balance at end of period, treasury at Jul. 31, 2024					$ (116,691)	(116,691)
Balance at end of period at Jul. 31, 2024	$ 264	$ 451,005	$ (12,069)	$ 1,190,126		$ 1,512,635