CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Income Statement [Abstract]
Net sales	$ 519,910	$ 405,131
Cost of goods sold	324,441	280,730
Gross profit	195,469	124,401
Selling, general and administrative expenses	141,603	154,620
Depreciation and amortization	7,044	9,867
Loss on lease modifications		3,187
Operating profit (loss)	46,822	(43,273)
Other income (loss)	1,820	(2,056)
Interest and financing charges, net	(12,004)	(10,379)
Income (loss) before income taxes	36,638	(55,708)
Income tax expense (benefit)	10,259	(16,413)
Net income (loss)	26,379	(39,295)
Less: Income attributable to noncontrolling interests	58
Net income (loss) attributable to G-III Apparel Group, Ltd.	$ 26,321	$ (39,295)
Basic:
Net income (loss) per common share	$ 0.54	$ (0.82)
Weighted average number of shares outstanding (in shares)	48,377	48,025
Diluted:
Net income per common share	$ 0.53	$ (0.82)
Weighted average number of shares outstanding (in shares)	49,510	48,025
Other comprehensive income:
Foreign currency translation adjustments	$ (6,959)	$ (4,026)
Other comprehensive loss	(6,959)	(4,026)
Comprehensive income	19,420	(43,321)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract]
Net loss	58
Foreign currency translation adjustments	(4)
Comprehensive income attributable to noncontrolling interests	54
Comprehensive income attributable to G-III Apparel Group, Ltd	$ 19,474	$ (43,321)