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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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