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v2.4.1.9

OTHER INCOME- (Detail Textuals) |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 1 Months Ended
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Jan. 31, 2015 USD ($) | Jan. 31, 2014 USD ($) | Aug. 07, 2012 USD ($) | Aug. 07, 2012 EUR (€) | Jan. 31, 2015 Vilebrequin USD ($) | Jan. 31, 2015 Vilebrequin EUR (€) | Oct. 31, 2014 Vilebrequin USD ($) | Oct. 31, 2014 Vilebrequin EUR (€) | Jan. 31, 2015 Unsecured promissory notes EUR (€) | Aug. 07, 2012 Unsecured promissory notes Vilebrequin | Jan. 31, 2015 G-III Leather Fashion, Inc. USD ($) | Sep. 30, 2014 G-III Leather Fashion, Inc. | Oct. 31, 2014 G-III Foreign Holding Unsecured promissory notes USD ($) | Oct. 31, 2014 G-III Foreign Holding Unsecured promissory notes EUR (€)
Other Non Recurring Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest sold in joint venture |  |  |  |  |  |  |  |  |  |  |  | 51.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = giii_GiiiLeatherFashionIncMember |  |
Gain on sale of interest in the joint venture |  |  |  |  |  |  |  |  |  |  | $ 1,900,000 giii_GainOnSaleOfInterestInJointVenture / dei_LegalEntityAxis = giii_GiiiLeatherFashionIncMember |  |  |
Consideration paid for termination |  |  |  |  |  |  |  |  |  |  | 3,500,000 giii_ConsiderationPaidForTermination / dei_LegalEntityAxis = giii_GiiiLeatherFashionIncMember |  |  |
Unsecured promissory notes |  |  |  |  |  |  |  |  | 15,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = giii_UnsecuredPromissoryNotesMember |  |  |  |  | 15,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = giii_UnsecuredPromissoryNotesMember / dei_LegalEntityAxis = giii_GiiiForeignHoldingMember
Stated interest rate per annum |  |  |  |  |  |  |  |  |  | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = giii_VilebrequinMember / us-gaap_DebtInstrumentAxis = giii_UnsecuredPromissoryNotesMember |  |  | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = giii_UnsecuredPromissoryNotesMember / dei_LegalEntityAxis = giii_GiiiForeignHoldingMember | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = giii_UnsecuredPromissoryNotesMember / dei_LegalEntityAxis = giii_GiiiForeignHoldingMember
Discounted purchase price of notes |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 giii_DebtInstrumentPurchasePrice / us-gaap_DebtInstrumentAxis = giii_UnsecuredPromissoryNotesMember / dei_LegalEntityAxis = giii_GiiiForeignHoldingMember | 13,500,000 giii_DebtInstrumentPurchasePrice / us-gaap_DebtInstrumentAxis = giii_UnsecuredPromissoryNotesMember / dei_LegalEntityAxis = giii_GiiiForeignHoldingMember
Rate of discount on outstanding principal amounts |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%giii_DiscountPercentageOnOutstandingPrincipalAmountOfDebt / us-gaap_DebtInstrumentAxis = giii_UnsecuredPromissoryNotesMember / dei_LegalEntityAxis = giii_GiiiForeignHoldingMember | 10.00%giii_DiscountPercentageOnOutstandingPrincipalAmountOfDebt / us-gaap_DebtInstrumentAxis = giii_UnsecuredPromissoryNotesMember / dei_LegalEntityAxis = giii_GiiiForeignHoldingMember
Gain due to purchase and capital contribution |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 giii_GainDueToPurchaseAndCapitalContribution / us-gaap_DebtInstrumentAxis = giii_UnsecuredPromissoryNotesMember / dei_LegalEntityAxis = giii_GiiiForeignHoldingMember | 1,500,000 giii_GainDueToPurchaseAndCapitalContribution / us-gaap_DebtInstrumentAxis = giii_UnsecuredPromissoryNotesMember / dei_LegalEntityAxis = giii_GiiiForeignHoldingMember
Fair value of contingent consideration | 973,000 us-gaap_BusinessCombinationContingentConsiderationLiability | 5,550,000 us-gaap_BusinessCombinationContingentConsiderationLiability | 27,900,000 us-gaap_BusinessCombinationContingentConsiderationLiability | 22,500,000 us-gaap_BusinessCombinationContingentConsiderationLiability |  |  | 1,000,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = giii_VilebrequinMember | 800,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = giii_VilebrequinMember |  |  |  |  |  |
Gain due to revision of estimate of contingent consideration |  |  |  |  | $ 4,200,000 giii_GainDueToRevisionOfEstimateOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = giii_VilebrequinMember | € 3,200,000 giii_GainDueToRevisionOfEstimateOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = giii_VilebrequinMember |  |  |  |  |  |  |  |

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