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Retirement Benefits (Amounts Recognized in Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 27, 2024 | Dec. 29, 2023
--- | --- | ---
Amounts recognized in consolidated balance sheets |  |
Non-current liabilities | $ 80,381 | $ 80,347
Pension Benefits |  |
Amounts recognized in consolidated balance sheets |  |
Non-current assets | 37,888 | 215
Current liabilities | 2,421 | 1,749
Non-current liabilities | 50,230 | 51,190
Net | 14,763 | 52,724
Postretirement Medical Benefits |  |
Amounts recognized in consolidated balance sheets |  |
Non-current assets | 0 | 0
Current liabilities | 1,633 | 1,745
Non-current liabilities | 18,702 | 20,909
Net | $ 20,335 | $ 22,654

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