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Retirement Plans (Contributions Expected to be Paid in Next Fiscal Year and Projected Benefit Payments) (Details)
$ in Thousands
Sep. 27, 2020
USD ($)
Supplemental Employee Retirement Plan  
Defined Benefit Plan Disclosure [Line Items]  
Estimated net contributions during fiscal 2021 $ 5,223
Defined Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
2020 19,948
2021 19,883
2022 19,947
2023 20,205
2024 20,678
2026-2030 111,465
Postretirement Health Plans  
Defined Benefit Plan Disclosure [Line Items]  
Estimated net contributions during fiscal 2021 1,260
2020 1,260
2021 1,276
2022 1,296
2023 1,319
2024 1,336
2026-2030 $ 6,634