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Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2022
Dec. 31, 2021
Dec. 25, 2020
Defined Benefit Plan Disclosure [Line Items]      
Non-service pension cost included in non-operating expense $ 1,000 $ 12,000 $ 5,000
Pension Benefits      
Components of net periodic benefit cost      
Service cost-benefits earned during the period 8,242 9,355 9,361
Interest cost on projected benefit obligation 10,996 11,409 13,313
Expected return on assets (19,754) (20,767) (18,814)
Amortization of prior service cost (credit) 84 246 294
Amortization of net loss (gain) 4,701 9,248 10,243
Settlement loss (gain) 0 12,285 0
Cost of pension plans which are not significant and have not adopted ASC 715 284 368 168
Net periodic benefit cost 4,553 22,144 14,565
Postretirement Medical Benefits      
Components of net periodic benefit cost      
Service cost-benefits earned during the period 516 670 609
Interest cost on projected benefit obligation 839 832 1,016
Expected return on assets 0 0 0
Amortization of prior service cost (credit) 0 0 0
Amortization of net loss (gain) 345 1,002 733
Settlement loss (gain) 0 0 0
Net periodic benefit cost $ 1,700 $ 2,504 $ 2,358