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Retirement Benefits (Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2024
Dec. 29, 2023
Dec. 30, 2022
Change in plan assets      
Employer contributions $ 20,000    
Pension Benefits      
Change in benefit obligation      
Obligation, beginning of year 213,575 $ 315,807  
Service cost 5,097 5,729 $ 8,242
Interest cost 9,194 16,535 10,996
Actuarial loss (gain) (19,973) 32,763  
Benefit payments (3,117) (12,103)  
Plan amendments (285) (250)  
Settlements (3,579) (149,212)  
Exchange rate changes (3,603) 4,306  
Obligation, end of year 197,309 213,575 315,807
Change in plan assets      
Fair value, beginning of year 160,851 281,175  
Actual return on assets 7,658 14,504  
Employer contributions 23,216 23,066  
Benefit payments (3,117) (12,103)  
Settlements (3,579) (149,212)  
Exchange rate changes (2,483) 3,421  
Fair value, end of year 182,546 160,851 281,175
Defined Benefit Plan, Funded (Unfunded) Status of Plan (14,763) (52,724)  
Postretirement Medical Benefits      
Change in benefit obligation      
Obligation, beginning of year 22,654 22,930  
Service cost 344 348 516
Interest cost 1,148 1,165 839
Actuarial loss (gain) (2,153) (237)  
Benefit payments (1,658) (1,552)  
Plan amendments 0 0  
Settlements 0 0  
Exchange rate changes 0 0  
Obligation, end of year 20,335 22,654 22,930
Change in plan assets      
Fair value, beginning of year 0 0  
Actual return on assets 0 0  
Employer contributions 1,658 1,552  
Benefit payments (1,658) (1,552)  
Settlements 0 0  
Exchange rate changes 0 0  
Fair value, end of year 0 0 $ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (20,335) $ (22,654)