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Pension Benefits - Contributions and Expected Benefit Payments (Details) - Pension Plan [Member]
$ in Thousands
12 Months Ended
Dec. 30, 2018
USD ($)
Pension Benefits  
Future employer contributions in next fiscal year $ 9,000
2019 104,269
2020 105,148
2021 106,587
2022 108,283
2023 109,385
2024-2028 558,349
Qualified Plan [Member]  
Pension Benefits  
Pension contributions 8,400
2019 86,901
2020 88,041
2021 89,678
2022 91,557
2023 92,962
2024-2028 480,374
Nonqualified Plan [Member]  
Pension Benefits  
2019 17,368
2020 17,107
2021 16,909
2022 16,726
2023 16,423
2024-2028 $ 77,975