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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. 29, 2023 | Dec. 30, 2022
Pension Benefits |  |
Amounts recognized in other comprehensive (income) loss |  |
Net gain (loss) arising during the period | $ (37,132) | $ 11,189
Amortization of net (gain) loss | 5,999 | 4,701
Prior service credit (cost) arising during the period | 250 | 267
Settlement (gain) loss | 42,169 | 0
Amortization of prior service (credit) cost | 36 | 84
Total | 11,322 | 16,241
Postretirement Medical Benefits |  |
Amounts recognized in other comprehensive (income) loss |  |
Net gain (loss) arising during the period | 237 | 9,044
Amortization of net (gain) loss | (133) | 345
Prior service credit (cost) arising during the period | 0 | 0
Settlement (gain) loss | 0 | 0
Amortization of prior service (credit) cost | 0 | 0
Total | $ 104 | $ 9,389

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