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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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