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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. 31, 2021 | Dec. 25, 2020
Pension Benefits |  |
Amounts recognized in other comprehensive (income) loss |  |
Net gain (loss) arising during the period | $ 42,039 | $ (8,872)
Amortization of net (gain) loss | 9,248 | 10,243
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 1,458 | 529
Settlement (gain) loss | 12,285 | 0
Amortization of prior service (credit) cost | 246 | 294
Total | 65,276 | 2,194
Postretirement Medical Benefits |  |
Amounts recognized in other comprehensive (income) loss |  |
Net gain (loss) arising during the period | (2,391) | 3,572
Amortization of net (gain) loss | 1,002 | 733
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 0
Settlement (gain) loss | 0 | 0
Amortization of prior service (credit) cost | 0 | 0
Total | $ 3,393 | $ (2,839)

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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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