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Retirement Benefits (Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 25, 2020
Information for plans with accumulated benefit obligation in excess of plan assets    
Projected benefit obligation $ 91,678 $ 463,959
Accumulated benefit obligation 88,927 418,372
Fair value of plan assets $ 30,926 $ 317,727