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COMMITMENTS AND CONTINGENCIES (Detail Textuals) $ in Millions, $ in Millions			1 Months Ended	12 Months Ended
	Mar. 14, 2018 USD ($)	Mar. 14, 2018 CAD ($)	Oct. 27, 2017	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)
Commitment And Contingencies [Line Items]
Rent expense				$ 110.4	$ 84.7	$ 75.6
CBSA
Commitment And Contingencies [Line Items]
Reassessment period to additional duties			90 days
License Agreements
Commitment And Contingencies [Line Items]
Royalty expense				154.3	139.0	123.7
Advertising expense				$ 43.4	$ 39.2	$ 36.1
License Agreements | Minimum
Commitment And Contingencies [Line Items]
Royalty payments as a percentage of net sales				4.00%
License Agreements | Maximum
Commitment And Contingencies [Line Items]
Royalty payments as a percentage of net sales				20.00%
G-III Apparel Canada ULC | Subsequent Event
Commitment And Contingencies [Line Items]
Value of bond issued for prepayments of additional duties	$ 20.9	$ 26.9
Duties amended based on new valuation method	$ 1.1	$ 1.4

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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