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Inventories (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 29, 2015
Sep. 28, 2014
Coffee Contracts [Member]    
Notional amounts of outstanding derivative contracts $ 36invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sbux_CoffeeContractsMember		 $ 45invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sbux_CoffeeContractsMember
Fixed Price Contract [Member]    
Amount of coffee committed to be purchased 787us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sbux_FixedPriceContractMember		  
Price-to-be-fixed Contract [Member]    
Amount of coffee committed to be purchased 257us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sbux_PriceToBeFixedContractMember		  
Future [Member] | Price-to-be-fixed Contract [Member]    
Notional amounts of outstanding derivative contracts 19invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ us-gaap_DerivativeInstrumentRiskAxis
= sbux_PriceToBeFixedContractMember		  
Collar Instruments [Member] | Price-to-be-fixed Contract [Member]    
Notional amounts of outstanding derivative contracts $ 17invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= sbux_CollarInstrumentsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= sbux_PriceToBeFixedContractMember