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INCOME TAXES - Reconciliation of Statutory Federal Income Tax Rate to Effective Rate Reported in Financial Statements (Detail 2)
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Income Tax Disclosure [Abstract]      
Provision for Federal income taxes at the statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State and local income taxes, net of Federal tax benefit 2.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Permanent differences resulting in Federal taxable income 2.90%giii_EffectiveIncomeTaxRateReconciliationPermanentDifferences 4.50%giii_EffectiveIncomeTaxRateReconciliationPermanentDifferences 4.80%giii_EffectiveIncomeTaxRateReconciliationPermanentDifferences
Foreign tax rate differential 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Foreign tax credit (6.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign (5.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign (2.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign
Other, net 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Actual provision for income taxes 35.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations