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Acquisitions and Divestitures (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended 20 Months Ended
Oct. 31, 2014
Jun. 26, 2016
Dec. 27, 2015
Jun. 28, 2015
Dec. 28, 2014
Jun. 26, 2016
Sep. 27, 2015
Jun. 28, 2015
Sep. 27, 2015
Jun. 26, 2016
Sep. 28, 2014
Business Acquisition [Line Items]                      
Gain resulting from acquisition of joint venture   $ 0.0   $ 0.0   $ 0.0   $ 390.6      
Germany Retail Operations [Member]                      
Business Acquisition [Line Items]                      
Purchase price of retail operations sold   47.3                  
Gain resulting from divestiture   30.1                  
Spain JV [Member]                      
Business Acquisition [Line Items]                      
Gain resulting from divestiture     $ 0.6                
Preexisting ownership percentage in equity method investment     49.00%                
Purchase price of joint venture sold     $ 30.2                
Starbucks Coffee Japan Ltd Member                      
Business Acquisition [Line Items]                      
Preexisting ownership percentage in equity method investment                     39.50%
Remaining Ownership Interest in Equity Method Investee to be Acquired                     60.50%
Cash paid to acquire additional ownership interest in Starbucks Japan $ 509.0           $ 362.0   $ 876.0    
Acquisition date Oct. 31, 2014                    
Goodwill, effect of foreign currency translation                   $ 46.0  
Intangible assets, effect of foreign currency translation                   18.2  
Goodwill   861.6                  
Intangible assets, acquired   341.2                  
Intangible assets, accumulated amortization   $ 87.4       $ 87.4       $ 87.4  
Gain resulting from acquisition of joint venture         $ 390.6