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Debt (Components of Long-Term Debt Including Associated Interest Rates and Related Fair Values) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 28, 2014
Sep. 28, 2014
Debt Instrument [Line Items]    
Total, Face Value $ 2,050.0us-gaap_DebtInstrumentCarryingAmount $ 2,050.0us-gaap_DebtInstrumentCarryingAmount
Aggregate unamortized discount 1.6us-gaap_DebtInstrumentUnamortizedDiscount 1.7us-gaap_DebtInstrumentUnamortizedDiscount
Total, Carrying Value, net of aggregate unamortized discount 2,048.4us-gaap_LongTermDebt 2,048.3us-gaap_LongTermDebt
Total, Estimated Fair Value 2,184us-gaap_LongTermDebtFairValue 2,164us-gaap_LongTermDebtFairValue
Point Eight Seven Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Value 400.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sbux_PointEightSevenFivePercentageSeniorNotesMember		 400.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sbux_PointEightSevenFivePercentageSeniorNotesMember
Stated Interest Rate 0.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sbux_PointEightSevenFivePercentageSeniorNotesMember		  
Effective Interest Rate 0.941%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= sbux_PointEightSevenFivePercentageSeniorNotesMember		 [1]  
Six Point Two Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Value 550.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sbux_SixPointTwoFivePercentageSeniorNotesMember		 550.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sbux_SixPointTwoFivePercentageSeniorNotesMember
Stated Interest Rate 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sbux_SixPointTwoFivePercentageSeniorNotesMember		  
Effective Interest Rate 6.292%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= sbux_SixPointTwoFivePercentageSeniorNotesMember		 [1]  
Two Point Zero Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Value 350.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sbux_TwoPointZeroPercentageSeniorNotesMember		 350.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sbux_TwoPointZeroPercentageSeniorNotesMember
Stated Interest Rate 2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sbux_TwoPointZeroPercentageSeniorNotesMember		  
Effective Interest Rate 2.012%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= sbux_TwoPointZeroPercentageSeniorNotesMember		 [1]  
Three Point Eight Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Value 750.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sbux_ThreePointEightFivePercentageSeniorNotesMember		 750.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sbux_ThreePointEightFivePercentageSeniorNotesMember
Stated Interest Rate 3.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sbux_ThreePointEightFivePercentageSeniorNotesMember		  
Effective Interest Rate 2.86%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= sbux_ThreePointEightFivePercentageSeniorNotesMember		 [1]  
Fair Value, Inputs, Level 2 [Member] | Point Eight Seven Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair value 399us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sbux_PointEightSevenFivePercentageSeniorNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 400us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sbux_PointEightSevenFivePercentageSeniorNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | Six Point Two Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair value 617us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sbux_SixPointTwoFivePercentageSeniorNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 625us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sbux_SixPointTwoFivePercentageSeniorNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | Two Point Zero Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair value 354us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sbux_TwoPointZeroPercentageSeniorNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 353us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sbux_TwoPointZeroPercentageSeniorNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | Three Point Eight Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair value $ 814us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sbux_ThreePointEightFivePercentageSeniorNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 $ 786us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= sbux_ThreePointEightFivePercentageSeniorNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
[1] Includes the effects of the amortization of any premium or discount and any gain or loss upon settlement of related treasury locks or forward-starting interest rate swaps utilized to hedge the interest rate risk prior to the debt issuance.