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Retirement Benefits (Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 25, 2020
Dec. 27, 2019
Change in plan assets      
Employer contributions $ 20,000    
Pension Benefits      
Change in benefit obligation      
Obligation, beginning of year 510,652 $ 449,419  
Service cost 9,355 9,361 $ 7,735
Interest cost 11,409 13,313 15,103
Actuarial loss (gain) (31,093) 46,545  
Benefit payments (13,360) (13,602)  
Plan changes (1,458) (529)  
Settlements (64,886) 0  
Exchange rate changes (2,568) 6,145  
Obligation, end of year 418,051 510,652 449,419
Change in plan assets      
Fair value, beginning of year 373,565 303,944  
Actual return on assets 30,984 58,068  
Employer contributions 22,493 22,237  
Benefit payments (13,360) (13,602)  
Settlements (64,886) 0  
Exchange rate changes (896) 2,918  
Fair value, end of year 347,900 373,565 303,944
Defined Benefit Plan, Funded (Unfunded) Status of Plan (70,151) (137,087)  
Postretirement Medical Benefits      
Change in benefit obligation      
Obligation, beginning of year 34,458 30,646  
Service cost 670 609 545
Interest cost 832 1,016 1,162
Actuarial loss (gain) (2,391) 3,572  
Benefit payments (1,447) (1,385)  
Plan changes 0 0  
Settlements 0 0  
Exchange rate changes 0 0  
Obligation, end of year 32,122 34,458 30,646
Change in plan assets      
Fair value, beginning of year 0 0  
Actual return on assets 0 0  
Employer contributions 1,447 1,385  
Benefit payments (1,447) (1,385)  
Settlements 0 0  
Exchange rate changes 0 0  
Fair value, end of year 0 0 $ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (32,122) $ (34,458)