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Pension Benefits - Contributions and Expected Benefit Payments (Details) - Pension Plan
$ in Thousands
12 Months Ended
Dec. 27, 2020
USD ($)
Pension Benefits  
Future employer contributions in next fiscal year $ 10,000
2021 86,994
2022 88,813
2023 90,628
2024 91,925
2025 93,157
2026-2030 477,426
Qualified Plan  
Pension Benefits  
Pension contributions 9,500
2021 69,821
2022 71,905
2023 73,927
2024 75,470
2025 76,982
2026-2030 399,881
Nonqualified Plan  
Pension Benefits  
2021 17,173
2022 16,908
2023 16,701
2024 16,455
2025 16,175
2026-2030 $ 77,545