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Equity and Cost Investments (Equity Method Investments) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Oct. 02, 2016
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 296.0 $ 432.8  
Revenues generated from related parties 112.8 187.3 $ 164.2
Related costs of sales 71.5 109.3 $ 97.5
Accounts receivables from equity method investees 41.2 54.3  
Cost Method Investments $ 38.7 48.8  
Starbucks Coffee Korea Co., Ltd. [Member]      
Schedule of Equity Method Investments [Line Items]      
Preexisting ownership percentage 50.00%    
Tata Starbucks Limited (India) [Member]      
Schedule of Equity Method Investments [Line Items]      
Preexisting ownership percentage 50.00%    
North American Coffee Partnership [Member]      
Schedule of Equity Method Investments [Line Items]      
Preexisting ownership percentage 50.00%    
Company Store Investees [Member]      
Schedule of Equity Method Investments [Line Items]      
Cost Method Investments $ 23.0 $ 23.0