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Employee Benefit Plans - Expected benefit payments (Details)
$ in Thousands
Nov. 26, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2017 $ 80,129
2018 77,300
2019 77,631
2020 78,153
2021 80,176
2022-2024 391,998
Pension plans, defined benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2017 68,564
2018 66,263
2019 66,986
2020 67,966
2021 70,559
2022-2024 353,302
Other postretirement benefit plans, defined benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2017 11,565
2018 11,037
2019 10,645
2020 10,187
2021 9,617
2022-2024 $ 38,696