Supplemental Income Statement Information (Store Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 28, 2021	Mar. 29, 2020	Mar. 28, 2021	Mar. 29, 2020
Store Operating Expenses [Line Items]
Wages and benefits	$ 1,664.9	$ 1,608.0	$ 3,271.1	$ 3,206.0
Occupancy costs	626.2	593.9	1,254.3	1,212.6
Other store operating expenses	532.2	519.5	1,165.3	1,124.3
Store operating expenses	$ 2,823.3	$ 2,721.4	$ 5,690.7	$ 5,542.9