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INCOME TAXES - Components of Income Tax Provision (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Current
Federal	$ 46,989us-gaap_CurrentFederalTaxExpenseBenefit	$ 36,828us-gaap_CurrentFederalTaxExpenseBenefit	$ 27,983us-gaap_CurrentFederalTaxExpenseBenefit
State and city	5,978us-gaap_CurrentStateAndLocalTaxExpenseBenefit	5,396us-gaap_CurrentStateAndLocalTaxExpenseBenefit	4,748us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	5,688us-gaap_CurrentForeignTaxExpenseBenefit	7,040us-gaap_CurrentForeignTaxExpenseBenefit	3,986us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit), Total	58,655us-gaap_CurrentIncomeTaxExpenseBenefit	49,264us-gaap_CurrentIncomeTaxExpenseBenefit	36,717us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred
Federal	1,422us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(3,328)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(1,168)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and city	(67)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	189us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(132)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign	(560)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(299)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	19us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total Deferred Income Tax Expense (Benefit), Total	795giii_TotalDeferredIncomeTaxExpenseBenefit	(3,438)giii_TotalDeferredIncomeTaxExpenseBenefit	(1,281)giii_TotalDeferredIncomeTaxExpenseBenefit
Income tax expense	59,450us-gaap_IncomeTaxExpenseBenefit	45,826us-gaap_IncomeTaxExpenseBenefit	35,436us-gaap_IncomeTaxExpenseBenefit
Income before income taxes
United States	133,709us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	104,435us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	80,145us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Non-United States	34,732us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	17,793us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	11,860us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before income taxes	$ 168,441us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	$ 122,228us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	$ 92,005us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

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