Leases - Schedule of Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2020	Dec. 29, 2019
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 409.4	$ 373.1
Variable lease costs	222.4	228.8
Short-term lease costs	8.7	8.3
Total lease costs	$ 640.5	$ 610.2