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Retirement Benefits Retirement Benefits (Level 3 Asset Rollforward) (Details) - Fair Value, Nonrecurring [Member] - Pension Benefits - Level 3 - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 25, 2020
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |
Balance, beginning of year | $ 31,877 | $ 27,675
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 2,430 | 2,255
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 2,556 | 1,425
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | (825) | 3,372
Balance, end of year | $ 30,926 | $ 31,877

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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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