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Retirement Benefits (Plan Assets by Category and Fair Value Measurement Level) (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 29, 2023 | Dec. 30, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | $ 160,851 | $ 281,175 | $ 347,900
Investments categorized in fair value hierarchy |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 37,576 | 32,514 |
Investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 123,275 | 248,661 |
Cash and cash equivalents | Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 1,425 | 351 |
Insurance contract | Level 3 | Fair Value, Nonrecurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 36,151 | 32,163 |
Equity | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 58,280 | 117,891 |
U.S. Large Cap | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 40,726 | 74,838 |
U.S. Small/Mid Cap | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 0 | 5,191 |
International | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 17,554 | 37,862 |
Fixed income | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 49,595 | 93,262 |
Real estate and other | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | $ 15,400 | $ 37,508 |

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