CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Income Statement [Abstract]
Net sales	$ 1,015,392	$ 826,561	$ 2,018,383	$ 1,528,904
Cost of goods sold	667,882	528,806	1,282,526	972,055
Gross profit	347,510	297,755	735,857	556,849
Selling, general and administrative expenses	182,360	177,625	470,803	454,347
Depreciation and amortization	7,024	10,187	21,166	29,745
Loss on lease modifications		(117)		17,372
Operating profit (loss)	158,126	110,060	243,888	55,385
Other income (loss)	898	225	4,693	112
Interest and financing charges, net	(12,354)	(18,681)	(36,932)	(38,237)
Income (loss) before income taxes	146,670	91,604	211,649	17,260
Income tax expense (benefit)	40,198	28,430	59,692	8,357
Net income (loss)	106,472	63,174	151,957	8,903
Less: Income attributable to noncontrolling interests	(202)		(206)
Net income (loss) attributable to G-III Apparel Group, Ltd.	$ 106,674	$ 63,174	$ 152,163	$ 8,903
Basic:
Net income (loss) per common share	$ 2.20	$ 1.31	$ 3.14	$ 0.18
Weighted average number of shares outstanding (in shares)	48,567	48,359	48,474	48,201
Diluted:
Net income per common share	$ 2.16	$ 1.29	$ 3.07	$ 0.18
Weighted average number of shares outstanding (in shares)	49,458	48,809	49,499	48,589
Other comprehensive income:
Foreign currency translation adjustments	$ (4,402)	$ 7,066	$ (9,340)	$ 6,814
Other comprehensive loss	(4,402)	7,066	(9,340)	6,814
Comprehensive income	102,070	70,240	142,617	15,717
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract]
Net loss	(202)		(206)
Foreign currency translation adjustments			6
Comprehensive income attributable to noncontrolling interests	(202)		(200)
Comprehensive income attributable to G-III Apparel Group, Ltd	$ 101,868	$ 70,240	$ 142,417	$ 15,717