CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Income Statement [Abstract]
Net sales	$ 2,055,146	$ 3,160,464	$ 3,076,208
Cost of goods sold	1,310,704	2,042,524	1,969,099
Gross profit	744,442	1,117,940	1,107,109
Selling, general and administrative expenses	605,102	832,180	834,763
Depreciation and amortization	38,625	38,735	38,819
Asset impairments, net of loss (gain) on lease terminations	17,873	19,371	2,813
Operating profit (loss)	82,842	227,654	230,714
Other loss	3,238	(1,149)	(2,960)
Interest and financing charges, net	(50,354)	(44,407)	(43,924)
Income before income taxes	35,726	182,098	183,830
Income tax expense	12,203	38,261	45,763
Net income	23,523	143,837	138,067
Less: Loss attributable to noncontrolling interests	(22)
Net income attributable to G-III Apparel Group, Ltd.	$ 23,545	$ 143,837	$ 138,067
Basic:
Net income (loss) per common share	$ 0.49	$ 2.98	$ 2.81
Weighted average number of shares outstanding (in shares)	48,242	48,209	49,140
Diluted:
Net income per common share	$ 0.48	$ 2.94	$ 2.75
Weighted average number of shares outstanding (in shares)	48,781	48,895	50,274
Other comprehensive income:
Foreign currency translation adjustments	$ (15,885)	$ (2,814)	$ (9,672)
Other comprehensive loss	(15,885)	(2,814)	(9,672)
Comprehensive income	7,638	141,023	128,395
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract]
Net loss	(22)
Foreign currency translation adjustments	(29)
Comprehensive income attributable to noncontrolling interests	(51)
Comprehensive income attributable to G-III Apparel Group, Ltd	$ 7,587	$ 141,023	$ 128,395