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STOCKHOLDERS' EQUITY (Detail Textuals) (USD $) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012 | Sep. 30, 2011
Stockholders Equity [Line Items] |  |  |  |  |  |
Number of common share sold | 1,725,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |
Number of shares sold to underwriters | 225,000 giii_NumberOfSharesSoldToUnderwriters |  |  |  |  |
Public offering price per share (in dollars per share) | $ 77.63 us-gaap_SharesIssuedPricePerShare |  |  |  |  |
Net proceed from offering | $ 128,700,000 us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 128,686,000 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |
Common stock, shares, repurchase program |  |  |  |  |  | 2,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Repurchases of common stock |  |  |  |  | 125,000 us-gaap_TreasuryStockSharesAcquired |
Repurchases of stock, value |  |  |  |  | 2,900,000 us-gaap_TreasuryStockValueAcquiredCostMethod |
Share repurchase description |  | The Company did not repurchase any shares during fiscal 2015. The Company's credit agreement permits G-III to make payments for cash dividends, stock redemptions and share repurchases subject to compliance with certain covenants. |  |  |  |
Shares available for grant |  | 480,683 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |  |  |
Expected dividend yield |  |  |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate |  |
Weighted average remaining term for stock options outstanding |  | 5 years 2 months 12 days |  |  |  |
Aggregate intrinsic value for stock options outstanding |  | 17,600,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue |  |  |  |
Aggregate intrinsic value for stock options exercisable |  | 10,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue |  |  |  |
Proceeds from exercise of stock options |  | 729,000,000 giii_ProceedsFromStockOptionsExercisedGross | 1,900,000 giii_ProceedsFromStockOptionsExercisedGross |  |  |
Intrinsic value of stock options exercised |  | 2,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 4,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |  |
Expected date through which unrecognized stock compensation is recognized |  | Jan. 31, 2017 |  |  |  |
Weighted average grant date fair value |  |  |  | $ 12.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 12.97 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |
Maximum |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Term of option awards |  | 10 years |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Recognized compensation expense |  | 11,600,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 9,200,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 7,000,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |
Unrecognized stock compensation related to restricted stock units |  | 32,200,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 26,100,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 21,400,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |
Restricted Stock Units (RSUs) | Minimum |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Vesting period of awards |  | 3 years |  |  |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Vesting period of awards |  | 5 years |  |  |  |
Stock Options |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Recognized compensation expense |  | 541,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 680,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,000,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Unrecognized stock compensation related to unvested option awards |  | $ 533,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |

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