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, 2024	$ 264	$ 458,841	$ (3,207)	$ 1,160,112	$ (65,750)	$ 1,550,260
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards exercised/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 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 (loss) attributable to G-III Apparel Group, Ltd.				30,014		30,014
Balance at end of period, treasury at Jul. 31, 2024						(116,691)
Balance at end of period at Jul. 31, 2024	264	451,005	(12,069)	1,190,126	(116,691)	1,512,635
Balance at beginning of period at Apr. 30, 2024	264	450,844	(10,090)	1,165,914	(87,057)	1,519,875
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards exercised/vested, net		(2,625)			2,625
Share-based compensation expense		5,528				5,528
Other comprehensive 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 (loss) attributable to G-III Apparel Group, Ltd.				24,212		24,212
Balance at end of period, treasury at Jul. 31, 2024						(116,691)
Balance at end of period at Jul. 31, 2024	264	451,005	(12,069)	1,190,126	(116,691)	1,512,635
Balance at beginning of period at Jan. 31, 2025	264	467,692	(25,519)	1,353,678	(116,634)	1,679,481
Balance at beginning of period, treasury at Jan. 31, 2025						(116,634)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards exercised/vested, net		(6,340)			6,340
Share-based compensation expense		10,967				10,967
Taxes paid for net share settlements		(4,944)				(4,944)
Other comprehensive income, net			49,034			49,034
Repurchases of common stock					(44,345)	(44,345)
Excise tax on stock repurchases					(370)	(370)
Net income (loss) attributable to G-III Apparel Group, Ltd.				18,698		18,698
Balance at end of period, treasury at Jul. 31, 2025						(155,009)
Balance at end of period at Jul. 31, 2025	264	467,375	23,515	1,372,376	(155,009)	1,708,521
Balance at beginning of period at Apr. 30, 2025	264	463,225	(9,402)	1,361,437	(131,430)	1,684,094
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity awards exercised/vested, net		(1,297)			1,297
Share-based compensation expense		5,447				5,447
Other comprehensive income, net			32,917			32,917
Repurchases of common stock					(24,644)	(24,644)
Excise tax on stock repurchases					(232)	(232)
Net income (loss) attributable to G-III Apparel Group, Ltd.				10,939		10,939
Balance at end of period, treasury at Jul. 31, 2025						(155,009)
Balance at end of period at Jul. 31, 2025	$ 264	$ 467,375	$ 23,515	$ 1,372,376	$ (155,009)	$ 1,708,521