Supplemental Income Statement Information (Store Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2020	Dec. 29, 2019
Store Operating Expenses [Line Items]
Labor and Related Expense	$ 1,606.2	$ 1,598.0
store occupancy cost	628.1	618.7
Other Store Operating Expenses	633.0	604.8
Store operating expenses	$ 2,867.3	$ 2,821.5