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Retirement Benefits (Plan Assets by Category and Fair Value Measurement Level) (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 25, 2020 | Dec. 27, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | $ 347,900 | $ 373,565 | $ 303,944
Investments categorized in fair value hierarchy |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 31,229 | 33,111 |
Investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 316,671 | 340,454 |
Cash and cash equivalents | Level 1 | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 303 | 1,234 |
Insurance contract | Level 3 | Fair Value, Nonrecurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 30,926 | 31,877 |
Equity | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 178,035 | 166,077 |
U.S. Large Cap | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 110,569 | 89,003 |
U.S. Small/Mid Cap | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 11,338 | 20,313 |
International | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 56,128 | 56,761 |
Fixed income | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 130,774 | 161,706 |
Real estate and other | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | $ 7,862 | $ 12,671 |

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