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Retirement Benefits (Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 29, 2023
Dec. 30, 2022
Information for plans with accumulated benefit obligation in excess of plan assets    
Projected benefit obligation $ 89,206 $ 72,190
Accumulated benefit obligation 81,701 69,395
Fair value of plan assets $ 36,150 $ 32,164