COMMITMENTS AND CONTINGENCIES - Textuals (Details) $ in Thousands, $ in Millions			1 Months Ended	12 Months Ended				35 Months Ended
	Mar. 14, 2018 USD ($)	Mar. 14, 2018 CAD ($)	Oct. 27, 2017	Jan. 31, 2021 USD ($)	Jan. 31, 2021 CAD ($)	Jan. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)	Jan. 31, 2021 USD ($)	Jan. 31, 2021 CAD ($)
Commitment And Contingencies [Line Items]
Advertising expense				$ 55,300		$ 94,700	$ 87,800
Interest paid				800	$ 1.0
Deferred expenses				0				$ 11,600	$ 14.4
CBSA
Commitment And Contingencies [Line Items]
Reassessment period to additional duties			90 days
Licenses
Commitment And Contingencies [Line Items]
Royalty expense				116,800		178,800	165,700
Advertising expense				$ 29,500		$ 48,300	$ 46,200
G-III Apparel Canada ULC
Commitment And Contingencies [Line Items]
Value of bond issued for prepayments of additional duties	$ 20,900	$ 26.9