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Retirement Benefits (Amounts recognized in other comprehensive (income) loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 27, 2024 | Dec. 29, 2023
Pension Benefits |  |
Amounts recognized in other comprehensive (income) loss |  |
Net gain (loss) arising during the period | $ 17,506 | $ (37,132)
Amortization of net (gain) loss | 3,255 | 5,999
Prior service credit (cost) arising during the period | 285 | 250
Settlement (gain) loss | 346 | 42,169
Amortization of prior service (credit) cost | (281) | 36
Total | 21,111 | 11,322
Postretirement Medical Benefits |  |
Amounts recognized in other comprehensive (income) loss |  |
Net gain (loss) arising during the period | 2,153 | 237
Amortization of net (gain) loss | 0 | (133)
Prior service credit (cost) arising during the period | 0 | 0
Settlement (gain) loss | 0 | 0
Amortization of prior service (credit) cost | 0 | 0
Total | $ 2,153 | $ 104

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