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Income Taxes (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 27, 2014
Sep. 27, 2014
Income Taxes    
Unrecognized tax benefits $ 14.8us-gaap_UnrecognizedTaxBenefits $ 14.8us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate 14.8us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Indemnification receivable associated with unrecognized tax benefits 7.2gmcr_UnrecognizedTaxBenefitsIndemnificationReceivable  
Maximum amount of unrecognized tax benefit indemnification 47.4gmcr_MaximumUnrecognizedTaxBenefitsIndemnifiable  
Accrued interest and penalties 2.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 2.4us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized tax benefits released due to the expiration of the statute of limitations 1.0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations  
Unrecognized tax benefits expected to be released in next 12 months due to expiration of statutes of limitations $ 7.8us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit