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Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2023
Dec. 30, 2022
Dec. 31, 2021
Components of net periodic benefit cost      
Settlement loss (gain) $ (42,000)   $ (12,000)
Pension Benefits      
Components of net periodic benefit cost      
Service cost-benefits earned during the period 5,729 $ 8,242 9,355
Interest cost on projected benefit obligation 16,535 10,996 11,409
Expected return on assets (19,141) (19,754) (20,767)
Amortization of prior service cost (credit) 36 84 246
Amortization of net loss (gain) 5,999 4,701 9,248
Settlement loss (gain) 42,169 0 12,285
Cost of pension plans which are not significant and have not adopted ASC 715 368 284 368
Net periodic benefit cost 51,695 4,553 22,144
Postretirement Medical Benefits      
Components of net periodic benefit cost      
Service cost-benefits earned during the period 348 516 670
Interest cost on projected benefit obligation 1,165 839 832
Expected return on assets 0 0 0
Amortization of prior service cost (credit) 0 0 0
Amortization of net loss (gain) (133) 345 1,002
Settlement loss (gain) 0 0 0
Net periodic benefit cost $ 1,380 $ 1,700 $ 2,504