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Retirement Benefits (Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2022
Dec. 31, 2021
Dec. 25, 2020
Change in plan assets      
Employer contributions $ 20,000 $ 20,000  
Pension Benefits      
Change in benefit obligation      
Obligation, beginning of year 418,051 510,652  
Service cost 8,242 9,355 $ 9,361
Interest cost 10,996 11,409 13,313
Actuarial loss (gain) (110,467) (31,093)  
Benefit payments (9,122) (13,360)  
Plan amendments (267) (1,458)  
Settlements 0 (64,886)  
Exchange rate changes (1,626) (2,568)  
Obligation, end of year 315,807 418,051 510,652
Change in plan assets      
Fair value, beginning of year 347,900 373,565  
Actual return on assets (80,078) 30,984  
Employer contributions 22,756 22,493  
Benefit payments (9,122) (13,360)  
Settlements 0 (64,886)  
Exchange rate changes (281) (896)  
Fair value, end of year 281,175 347,900 373,565
Defined Benefit Plan, Funded (Unfunded) Status of Plan (34,632) (70,151)  
Postretirement Medical Benefits      
Change in benefit obligation      
Obligation, beginning of year 32,122 34,458  
Service cost 516 670 609
Interest cost 839 832 1,016
Actuarial loss (gain) (9,044) (2,391)  
Benefit payments (1,503) (1,447)  
Plan amendments 0 0  
Settlements 0 0  
Exchange rate changes 0 0  
Obligation, end of year 22,930 32,122 34,458
Change in plan assets      
Fair value, beginning of year 0 0  
Actual return on assets 0 0  
Employer contributions 1,503 1,447  
Benefit payments (1,503) (1,447)  
Settlements 0 0  
Exchange rate changes 0 0  
Fair value, end of year 0 0 $ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (22,930) $ (32,122)