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Equity and Cost Investments (Equity Method Investments) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 01, 2017
Dec. 27, 2015
Oct. 01, 2017
Oct. 02, 2016
Sep. 27, 2015
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 432.8   $ 432.8 $ 305.7  
Revenues generated from related parties     187.3 164.2 $ 153.4
Related costs of sales     109.3 97.5 $ 94.5
Accounts receivables from equity method investees $ 54.3   $ 54.3 $ 55.7  
Starbucks Coffee Korea Co., Ltd. [Member]          
Schedule of Equity Method Investments [Line Items]          
Preexisting ownership percentage 50.00%   50.00%    
President Starbucks Coffee (Shanghai) [Member]          
Schedule of Equity Method Investments [Line Items]          
Preexisting ownership percentage 50.00%   50.00%    
President Starbucks Coffee Corporation (Taiwan) [Member]          
Schedule of Equity Method Investments [Line Items]          
Preexisting ownership percentage 50.00%   50.00%    
Tata Starbucks Limited (India) [Member]          
Schedule of Equity Method Investments [Line Items]          
Preexisting ownership percentage 50.00%   50.00%    
North American Coffee Partnership [Member]          
Schedule of Equity Method Investments [Line Items]          
Preexisting ownership percentage 50.00%   50.00%    
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