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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 03, 2022
Mar. 28, 2021
Apr. 03, 2022
Mar. 28, 2021
Oct. 03, 2021
Sep. 28, 2020
Payroll Tax Incentives $ 12.4 $ 97.4 $ 23.9 $ 117.2    
Government subsidies receivables 97.1   97.1   $ 172.4  
Deferred Payroll Tax Payments, Current 116.4   116.4   116.4  
Deferred Payroll Tax Payments, Noncurrent         116.4  
Restructuring and Related Cost, Incurred Cost   23.0 95.2      
Retained Earnings (Accumulated Deficit) (9,070.5)   (9,070.5)   (6,315.7)  
Accrued payroll and benefits $ 665.9   665.9   $ 772.3  
Accounting Standards Update 2016-13 [Member]            
Retained Earnings (Accumulated Deficit)           $ 2.2
Facility Closing [Member]            
Restructuring and Related Cost, Incurred Cost   8.6 51.2      
Accelerated Lease ROU Asset Amortization and Other Lease Costs [Member]            
Restructuring and Related Cost, Incurred Cost   $ 14.4 $ 44.0