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Derivative Financial Instruments (Pretax Gains and Losses on Derivative Contracts Not Designated as Hedging Instruments Recognized in Earnings) (Details) (Not Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 28, 2014 | Dec. 29, 2013
Foreign Exchange Contract - Other [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains/(Losses) Recognized in Earnings | $ 18.6 us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ (0.9)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Coffee Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains/(Losses) Recognized in Earnings | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = sbux_CoffeeContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = sbux_CoffeeContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Dairy Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains/(Losses) Recognized in Earnings | (4.5)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = sbux_DairyContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 4.5 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = sbux_DairyContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Diesel Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains/(Losses) Recognized in Earnings | $ (7.6)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = sbux_DieselContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = sbux_DieselContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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