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Notes Payable (Detail Textuals)
In Millions, unless otherwise specified
1 Months Ended 1 Months Ended
Aug. 31, 2012
USD ($)
Apr. 30, 2015
USD ($)
Apr. 30, 2014
USD ($)
Oct. 31, 2014
Unsecured promissory notes
EUR (€)
Aug. 31, 2012
LIBOR plus
Minimum
Aug. 31, 2012
LIBOR plus
Maximum
Aug. 31, 2012
Prime plus
Minimum
Aug. 31, 2012
Prime plus
Maximum
Debt Instrument [Line Items]                
Senior secured credit facility $ 450us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity              
Term of senior secured credit facility 5 years              
Amount available under credit agreement   373.5us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity            
Spread interest rate         1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
Amounts payable under the company's credit agreement     63.0us-gaap_LineOfCredit          
Unsecured promissory notes       € 15.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= giii_UnsecuredPromissoryNotesMember