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Fair Value Measurements (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jul. 02, 2017
Sep. 29, 2019
Sep. 30, 2018
Oct. 01, 2017
Jul. 01, 2018
Debt Securities, Available-for-sale [Abstract]          
Proceeds from sale of available-for-sale securities   $ 291,100,000 $ 459,000,000.0 $ 999,700,000  
Trading Securities [Abstract]          
Management Deferred Compensation Plan liability   92,100,000 102,200,000    
Goodwill, Impairment Loss   10,500,000 37,600,000 87,200,000  
Goodwill   3,490,800,000 3,541,600,000 $ 1,539,200,000  
Other intangible assets   $ 781,800,000 1,042,200,000    
Maximum [Member]          
Debt Securities, Available-for-sale [Abstract]          
Long-term investments, contractual maturity period   4 years      
Teavana [Member]          
Trading Securities [Abstract]          
Goodwill, Impairment Loss $ 69,300,000        
Goodwill $ 398,300,000       $ 398,300,000
Starbucks Coffee Switzerland [Member]          
Trading Securities [Abstract]          
Goodwill, Impairment Loss     $ 37,600,000