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Employee Pension and Profit Sharing Plans - Schedule of Multiemployer Contributions (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Service Employees Pension Fund of Upstate New York      
Multiepmloyer Plans [Line Items]      
Percentage of participants covered by CBA 60.00%    
Local 1102 Retirement Trust      
Multiepmloyer Plans [Line Items]      
Percentage of participants covered by CBA 90.00%    
SEIU National Industry Pension Fund      
Multiepmloyer Plans [Line Items]      
Percentage of participants covered by CBA 75.00%    
Multiemployer Pension Plans      
Multiepmloyer Plans [Line Items]      
Multiemployer plan, contributions by employer $ 33,561 $ 32,623 $ 28,689
Multiemployer Pension Plans | National Retirement Fund      
Multiepmloyer Plans [Line Items]      
Multiemployer plan, contributions by employer 4,130 4,147 7,541
Multiemployer Pension Plans | UNITE HERE Retirement Fund      
Multiepmloyer Plans [Line Items]      
Multiemployer plan, contributions by employer 4,531 3,686  
Multiemployer Pension Plans | Local 1102 Retirement Trust      
Multiepmloyer Plans [Line Items]      
Multiemployer plan, contributions by employer 110 1,206 397
Multiemployer Pension Plans | Central States SE and SW Areas Pension Plan      
Multiepmloyer Plans [Line Items]      
Multiemployer plan, contributions by employer 4,282 4,128 3,836
Multiemployer Pension Plans | Pension Plan for Hospital & Health Care Employees Philadelphia & Vicinity      
Multiepmloyer Plans [Line Items]      
Multiemployer plan, contributions by employer 361 319 336
Multiemployer Pension Plans | Local 731 Private Scavengers and Garage Attendants Pension Trust Fund      
Multiepmloyer Plans [Line Items]      
Multiemployer plan, contributions by employer 973 907 898
Multiemployer Pension Plans | SEIU National Industry Pension Fund      
Multiepmloyer Plans [Line Items]      
Multiemployer plan, contributions by employer 623 501 429
Multiemployer Pension Plans | LUNA National Industrial Pension Fund      
Multiepmloyer Plans [Line Items]      
Multiemployer plan, contributions by employer 678 620 584
Multiemployer Pension Plans | Other funds      
Multiepmloyer Plans [Line Items]      
Multiemployer plan, contributions by employer $ 17,873 $ 17,109 $ 14,668