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Derivative Financial Instruments Derivative Financial Instruments (Narrative) (Details)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended
Dec. 28, 2014
USD ($)
Dec. 29, 2013
USD ($)
Dec. 28, 2014
JPY (¥)
Dec. 28, 2014
Starbucks Coffee Japan Ltd Member
USD ($)
Sep. 28, 2014
Starbucks Coffee Japan Ltd Member
Dec. 28, 2014
Interest Rate Swap [Member]
USD ($)
Dec. 28, 2014
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net Investment Hedging [Member]
USD ($)
Dec. 29, 2013
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net Investment Hedging [Member]
USD ($)
Dec. 28, 2014
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net Investment Hedging [Member]
Starbucks Coffee Japan Ltd Member
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]                  
Derivative, Notional Amount     ¥ 73,500invest_DerivativeNotionalAmount     $ 250invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember		      
Gain resulting from acquisition of joint venture $ 390.6us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain $ 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain   $ 390.6us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_BusinessAcquisitionAxis
= sbux_StarbucksCoffeeJapanLtdMember		     $ 7.2us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NetInvestmentHedgingMember		 [1] $ 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NetInvestmentHedgingMember		 [1] $ 7.2us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_BusinessAcquisitionAxis
= sbux_StarbucksCoffeeJapanLtdMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NetInvestmentHedgingMember
Preexisting ownership percentage in Starbucks Japan         39.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= sbux_StarbucksCoffeeJapanLtdMember		        
[1] Release of pretax cumulative net gains in AOCI related to our net investment derivative instruments used to hedge our preexisting 39.5% equity method investment in Starbucks Japan.