Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Lessee, Lease, Description [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 19.8		$ 115.0
Leases [Abstract]
Lessee, operating lease, lease not yet commenced, amount	$ 846.7		$ 846.7
Minimum [Member]
Leases [Abstract]
Lessee, operating lease, lease not yet commenced, term of contract	3 years		3 years
Maximum [Member]
Leases [Abstract]
Lessee, operating lease, lease not yet commenced, term of contract	20 years		20 years
Accelerated Lease ROU Asset Amortization and Other Lease Costs [Member]
Lessee, Lease, Description [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 12.2	$ 13.4	$ 56.2	$ 17.0