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Employee Pension and Profit Sharing Plans - Schedule of Allocation of Plan Assets (Details) - USD ($)
$ in Thousands
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 425,967 $ 409,826 $ 341,538
Quoted Prices in Active Markets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 24,073 32,257  
Significant Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 391,469 367,124  
Significant Unobservable Inputs Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,425 10,445  
Cash and Cash Equivalents and Other | Quoted Prices in Active Markets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 19,396 20,568  
Investment Trusts | Quoted Prices in Active Markets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,677 11,689  
Pooled Funds - Equity | Significant Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 72,074 220,853  
Pooled Funds - Fixed Income | Significant Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 319,395 146,271  
Real Estate | Quoted Prices in Active Markets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Real Estate | Significant Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Real Estate | Significant Unobservable Inputs Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,425 10,445  
Fair Value Disclosure      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 425,967 409,826  
Fair Value Disclosure | Cash and Cash Equivalents and Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 19,396 20,568  
Fair Value Disclosure | Investment Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,677 11,689  
Fair Value Disclosure | Pooled Funds - Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 72,074 220,853  
Fair Value Disclosure | Pooled Funds - Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 319,395 146,271  
Fair Value Disclosure | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 10,425 $ 10,445