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Pension Benefits - Contributions and Expected Benefit Payments (Details)
$ in Thousands
12 Months Ended
Dec. 25, 2016
USD ($)
Pension Plan [Member]  
Pension Benefits  
Future employer contributions in next fiscal year $ 9,000
Qualified Plans [Member]  
Pension Benefits  
Pension contributions 7,800
2017 104,974
2018 105,560
2019 106,665
2020 107,636
2021 108,888
2022-2026 561,671
Non-Qualified Plans [Member]  
Pension Benefits  
2017 17,136
2018 17,121
2019 16,998
2020 16,738
2021 16,599
2022-2026 79,433
Company Sponsored Pension Plan [Member]  
Pension Benefits  
2017 122,110
2018 122,681
2019 123,663
2020 124,374
2021 125,487
2022-2026 $ 641,104