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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 27, 2024 | Dec. 29, 2023 | Dec. 30, 2022
Class of Stock |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) |  | Other Nonoperating Income (Expense)
Pension Benefits |  |  |
Class of Stock |  |  |
Pension settlement losses | $ (346) | $ (42,169) | $ 0
Pension Plan - Blue and Gray Plans | Pension Benefits |  |  |
Class of Stock |  |  |
Pension settlement losses |  | $ 42,000 |
Cumulative Preferred Stock |  |  |
Class of Stock |  |  |
Preferred stock authorized (in shares) | 22,549 |  |
Preferred stock par value (in dollars per share) | $ 100 |  |
Preferred Stock |  |  |
Class of Stock |  |  |
Preferred stock authorized (in shares) | 3,000,000 |  |
Preferred stock par value (in dollars per share) | $ 1 |  |

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