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Equity and Cost Investments (Equity Method Investments) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 27, 2015
Sep. 28, 2014
Oct. 02, 2016
Sep. 27, 2015
Sep. 28, 2014
Schedule of Equity Method Investments [Line Items]          
Equity method investments     $ 305.7 $ 306.4  
Revenues generated from related parties     164.2 153.4 $ 219.2
Related costs of sales     97.5 94.5 $ 121.2
Accounts receivables from equity method investees     $ 55.7 $ 36.7  
Starbucks Coffee Korea Co., Ltd. [Member]          
Schedule of Equity Method Investments [Line Items]          
Preexisting ownership percentage     50.00%    
President Starbucks Coffee (Shanghai) [Member]          
Schedule of Equity Method Investments [Line Items]          
Preexisting ownership percentage     50.00%    
President Starbucks Coffee Corporation (Taiwan) [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%    
Berjaya Starbucks Coffee Company Sdn. Bhd. (Malaysia) [Member]          
Schedule of Equity Method Investments [Line Items]          
Preexisting ownership percentage   50.00%     50.00%
Proceeds from sale of equity method investments   $ 88.0      
Gain on sale of investments   $ 67.8      
Spain JV [Member]          
Schedule of Equity Method Investments [Line Items]          
Preexisting ownership percentage 49.00%        
Proceeds from divestiture of interest in joint venture $ 30.2        
Gain/(loss) resulting from divestiture insignificant