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Summary of Significant Accounting Policies Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Mar. 29, 2020
Sep. 30, 2019
Sep. 29, 2019
Goodwill [Line Items]          
Goodwill     $ 3,493.0   $ 3,490.8
Operating Lease, Right-of-Use Asset     8,260.8   0.0
Retained Earnings (Accumulated Deficit)     (7,050.6)   (5,771.2)
Operating Lease, Liability, Noncurrent     7,650.4   0.0
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
store occupancy cost $ 591.8 $ 1,200.0      
Operating Lease, Liability, Noncurrent     7,650.4   0.0
Retained Earnings (Accumulated Deficit)     $ (7,050.6)   $ (5,771.2)
Accounting Standards Update 2016-02 [Member]          
Goodwill [Line Items]          
Operating Lease, Right-of-Use Asset       $ 8,400.0  
Retained Earnings (Accumulated Deficit)       17.3  
Operating Lease, Liability, Noncurrent       9,000.0  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Lease, Liability, Noncurrent       9,000.0  
Retained Earnings (Accumulated Deficit)       17.3  
Deferred Rent Credit       $ 568.0