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Retirement Benefits (Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2023
Dec. 30, 2022
Dec. 31, 2021
Change in benefit obligation      
Settlements $ (147,000)    
Change in plan assets      
Employer contributions 20,000 $ 20,000  
Pension Benefits      
Change in benefit obligation      
Obligation, beginning of year 315,807 418,051  
Service cost 5,729 8,242 $ 9,355
Interest cost 16,535 10,996 11,409
Actuarial loss (gain) 32,763 (110,467)  
Benefit payments (12,103) (9,122)  
Plan amendments (250) (267)  
Settlements (149,212) 0  
Exchange rate changes 4,306 (1,626)  
Obligation, end of year 213,575 315,807 418,051
Change in plan assets      
Fair value, beginning of year 281,175 347,900  
Actual return on assets 14,504 (80,078)  
Employer contributions 23,066 22,756  
Benefit payments (12,103) (9,122)  
Settlements (149,212) 0  
Exchange rate changes 3,421 (281)  
Fair value, end of year 160,851 281,175 347,900
Defined Benefit Plan, Funded (Unfunded) Status of Plan (52,724) (34,632)  
Postretirement Medical Benefits      
Change in benefit obligation      
Obligation, beginning of year 22,930 32,122  
Service cost 348 516 670
Interest cost 1,165 839 832
Actuarial loss (gain) (237) (9,044)  
Benefit payments (1,552) (1,503)  
Plan amendments 0  
Settlements 0 0  
Exchange rate changes 0 0  
Obligation, end of year 22,654 22,930 32,122
Change in plan assets      
Fair value, beginning of year 0 0  
Actual return on assets 0 0  
Employer contributions 1,552 1,503  
Benefit payments (1,552) (1,503)  
Settlements 0 0  
Exchange rate changes 0 0  
Fair value, end of year 0 0 $ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (22,654) $ (22,930)