Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 02, 2022	Dec. 27, 2020	Oct. 03, 2021	Sep. 28, 2020
Payroll Tax Incentives	$ 11.5	$ 19.8
Government subsidies receivables	98.8		$ 172.4
Deferred Payroll Tax Payments, Current	116.5		116.4
Deferred Payroll Tax Payments, Noncurrent			116.4
Restructuring and Related Cost, Incurred Cost		72.2
Retained Earnings (Accumulated Deficit)	(8,753.0)		(6,315.7)
Accrued payroll and benefits	$ 664.1		$ 772.3
Accounting Standards Update 2016-13 [Member]
Retained Earnings (Accumulated Deficit)				$ 2.2
Facility Closing [Member]
Restructuring and Related Cost, Incurred Cost		42.6
Accelerated Lease ROU Asset Amortization and Other Lease Costs [Member]
Restructuring and Related Cost, Incurred Cost		$ 29.6