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Retirement Plans (Contributions Expected to be Paid in Next Fiscal Year and Projected Benefit Payments) (Details)
$ in Thousands
Sep. 29, 2019
USD ($)
Supplemental Employee Retirement Plan  
Defined Benefit Plan Disclosure [Line Items]  
Estimated net contributions during fiscal 2020 $ 5,371
Defined Benefit Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2020 123,471
2021 18,371
2022 18,681
2023 19,135
2024 19,690
2025-2029 109,169
Postretirement Health Plans  
Defined Benefit Plan Disclosure [Line Items]  
Estimated net contributions during fiscal 2020 1,401
2020 1,401
2021 1,431
2022 1,476
2023 1,574
2024 1,607
2025-2029 $ 8,242