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Employee Pension and Profit Sharing Plans - Schedule of Allocation of Plan Assets (Details) - USD ($)
$ in Thousands
Oct. 02, 2020
Sep. 27, 2019
Sep. 28, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 439,053 $ 425,967 $ 409,826
Quoted Prices in Active Markets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 80,789 24,073  
Significant Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 347,201 391,469  
Significant Unobservable Inputs Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11,063 10,425  
Cash and Cash Equivalents and Other | Quoted Prices in Active Markets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 76,072 19,396  
Investment Trusts | Quoted Prices in Active Markets Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,717 4,677  
Pooled Funds - Equity | Significant Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 74,852 72,074  
Pooled Funds - Fixed Income | Significant Other Observable Inputs Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 272,349 319,395  
Real Estate | Significant Unobservable Inputs Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11,063 10,425  
Fair Value Disclosure      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 439,053 425,967  
Fair Value Disclosure | Cash and Cash Equivalents and Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 76,072 19,396  
Fair Value Disclosure | Investment Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,717 4,677  
Fair Value Disclosure | Pooled Funds - Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 74,852 72,074  
Fair Value Disclosure | Pooled Funds - Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 272,349 319,395  
Fair Value Disclosure | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 11,063 $ 10,425