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Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 25, 2020 | Dec. 27, 2019
Pension Benefits |  |  |
Components of net periodic benefit cost |  |  |
Service cost-benefits earned during the period | $ 9,355 | $ 9,361 | $ 7,735
Interest cost on projected benefit obligation | 11,409 | 13,313 | 15,103
Expected return on assets | (20,767) | (18,814) | (17,152)
Amortization of prior service cost (credit) | 246 | 294 | 279
Amortization of net loss (gain) | 9,248 | 10,243 | 8,392
Settlement loss (gain) | 12,285 | 0 | 0
Cost of pension plans which are not significant and have not adopted ASC 715 | 368 | 168 | 110
Net periodic benefit cost | 22,144 | 14,565 | 14,467
Postretirement Medical Benefits |  |  |
Components of net periodic benefit cost |  |  |
Service cost-benefits earned during the period | 670 | 609 | 545
Interest cost on projected benefit obligation | 832 | 1,016 | 1,162
Expected return on assets | 0 | 0 | 0
Amortization of prior service cost (credit) | 0 | 0 | 0
Amortization of net loss (gain) | 1,002 | 733 | 273
Settlement loss (gain) | 0 | 0 | 0
Net periodic benefit cost | 2,504 | 2,358 | 1,980
Accounting Standards Update 2017-07 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Non-service pension cost included in non-operating expense | $ 12,000 | $ 5,000 | $ 5,000

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