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Pension and Other Postretirement Benefit Plans - Schedule of Contribution to Multiemployer Pension Plans (Details) - Multiemployer Plans, Pension - Multiemployer Plan, Individually Insignificant Multiemployer Plans - USD ($)
$ in Thousands
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Multiemployer Plans [Line Items]      
Contributions to multiemployer pension plans $ 33,187 $ 56,567 $ 45,942
Canada      
Multiemployer Plans [Line Items]      
Contributions to multiemployer pension plans 16,625 36,354 35,182
Europe      
Multiemployer Plans [Line Items]      
Contributions to multiemployer pension plans 9,413 10,677 6,212
United States      
Multiemployer Plans [Line Items]      
Contributions to multiemployer pension plans $ 7,149 $ 9,536 $ 4,548