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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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