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COMMITMENTS AND CONTINGENCIES (Detail Textuals) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Commitment And Contingencies [Line Items]      
Rent expense $ 72.6us-gaap_LeaseAndRentalExpense $ 48.3us-gaap_LeaseAndRentalExpense $ 31.6us-gaap_LeaseAndRentalExpense
Advertising expense 71.5us-gaap_AdvertisingExpense 62.3us-gaap_AdvertisingExpense 54.1us-gaap_AdvertisingExpense
License Agreements      
Commitment And Contingencies [Line Items]      
Royalty expense 109.6us-gaap_RoyaltyExpense
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
101.5us-gaap_RoyaltyExpense
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
85.2us-gaap_RoyaltyExpense
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
Advertising expense $ 32.1us-gaap_AdvertisingExpense
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
$ 30.0us-gaap_AdvertisingExpense
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
$ 24.9us-gaap_AdvertisingExpense
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
License Agreements | Minimum      
Commitment And Contingencies [Line Items]      
Royalty payments as a percentage of net sales 4.00%giii_PercentOfRoyaltyOnNetSale
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
License Agreements | Maximum      
Commitment And Contingencies [Line Items]      
Royalty payments as a percentage of net sales 19.00%giii_PercentOfRoyaltyOnNetSale
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember