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Equity Method and Other Investments (Equity Method Investments) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Oct. 01, 2017
Schedule of Equity Method Investments [Line Items]      
Equity Method Investments $ 336.1 $ 296.0  
Revenues generated from related parties 130.7 112.8 $ 187.3
Related costs of sales 73.2 71.5 $ 109.3
Accounts receivables from equity method investees 35.5 41.2  
Equity Investments $ 396.0 $ 334.7  
Starbucks Coffee Korea Co., Ltd. [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%    
Tata Starbucks Limited (India) [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%    
North American Coffee Partnership [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%    
Company Store Investees [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Investments $ 23.0