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Retirement Benefits (Plan Assets by Category and Fair Value Measurement Level) (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 27, 2024 | Dec. 29, 2023 | Dec. 30, 2022
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | $ 182,546 | $ 160,851 | $ 281,175
Investments categorized in fair value hierarchy |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 32,581 | 37,576 |
Investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 149,965 | 123,275 |
Cash and cash equivalents | Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 115 | 1,425 |
Insurance contract | Level 3 | Fair Value, Nonrecurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 32,466 | 36,151 |
Equity | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 81,089 | 58,280 |
U.S. Large Cap | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 64,645 | 40,726 |
International | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 16,444 | 17,554 |
Fixed income | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 64,331 | 49,595 |
Real estate and other | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | $ 4,545 | $ 15,400 |

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