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Retirement Benefits (Amounts Recognized in Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 29, 2023 | Dec. 30, 2022
--- | --- | ---
Amounts recognized in consolidated balance sheets |  |
Non-current liabilities | $ 80,347 | $ 61,672
Pension Benefits |  |
Amounts recognized in consolidated balance sheets |  |
Non-current assets | 215 | 5,398
Current liabilities | 1,749 | 1,860
Non-current liabilities | 51,190 | 38,170
Net | 52,724 | 34,632
Postretirement Medical Benefits |  |
Amounts recognized in consolidated balance sheets |  |
Non-current assets | 0 | 0
Current liabilities | 1,745 | 1,763
Non-current liabilities | 20,909 | 21,167
Net | $ 22,654 | $ 22,930

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