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Retirement Benefits (Amounts Recognized in Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 30, 2022
Dec. 31, 2021
Amounts recognized in consolidated balance sheets    
Non-current liabilities $ 61,672 $ 106,897
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid Expense, Noncurrent 5,398 0
Amounts recognized in consolidated balance sheets    
Current liabilities 1,860 1,769
Non-current liabilities 38,170 68,382
Net 34,632 70,151
Postretirement Medical Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid Expense, Noncurrent 0 0
Amounts recognized in consolidated balance sheets    
Current liabilities 1,763 1,768
Non-current liabilities 21,167 30,354
Net $ 22,930 $ 32,122