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COMMITMENTS AND CONTINGENCIES (Detail Textuals) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013
Commitment And Contingencies [Line Items] |  |  |
Rent expense | $ 72.6 us-gaap_LeaseAndRentalExpense | $ 48.3 us-gaap_LeaseAndRentalExpense | $ 31.6 us-gaap_LeaseAndRentalExpense
Advertising expense | 71.5 us-gaap_AdvertisingExpense | 62.3 us-gaap_AdvertisingExpense | 54.1 us-gaap_AdvertisingExpense
License Agreements |  |  |
Commitment And Contingencies [Line Items] |  |  |
Royalty expense | 109.6 us-gaap_RoyaltyExpense / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 101.5 us-gaap_RoyaltyExpense / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 85.2 us-gaap_RoyaltyExpense / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Advertising expense | $ 32.1 us-gaap_AdvertisingExpense / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | $ 30.0 us-gaap_AdvertisingExpense / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | $ 24.9 us-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 |  |

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- Definition Percent Of Royalty On Net Sale + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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Balance Type: | debit
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Balance Type: | debit
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- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_RoyaltyExpense
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Balance Type: | debit
Period Type: | duration

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