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Equity (Narrative) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Apr. 09, 2015
$ / shares
Sep. 27, 2015
USD ($)
$ / shares
shares
Sep. 28, 2014
USD ($)
$ / shares
shares
Jul. 23, 2015
shares
Class of Stock [Line Items]        
Stock split conversion ratio 2      
Common stock, par value | $ / shares   $ 0.001 $ 0.001  
Increase of shares to ongoing share repurchase authorization       50,000,000
Authorized shares of common stock   2,400,000,000 2,400,000,000  
Authorized shares of preferred stock   7,500,000    
Outstanding shares of preferred stock   0    
Increase in share of net assets of Starbucks Japan at IPO | $   $ 39.4 $ 39.4  
Other Additional Capital related to difference between carrying value of noncontrolling interest and cash paid to acquire the noncontrolling interest | $   $ 1.7    
Shares of common stock repurchased   29,000,000 21,000,000  
Total cost of common stock repurchased | $   $ 1,400.0 $ 769.8  
Shares available for repurchase   52,700,000    
Common Stock [Member]        
Class of Stock [Line Items]        
Stock split conversion ratio 2      
Common stock, par value | $ / shares $ 0.001