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Equity Method and Other Investments (Equity Method Investments) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]      
Revenues generated from related parties $ 123.9 $ 130.7 $ 112.8
Related product and distribution costs 79.8 73.2 $ 71.5
Accounts receivables from equity method investees $ 28.7 $ 35.5  
Starbucks Coffee Korea Co., Ltd. [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%    
Tata Starbucks Limited (India) [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%