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Pension Benefits - Schedule of Accumulated Benefit Obligations In Excess of Fair Value (Details) - Pension Plan - USD ($)
$ in Thousands
Dec. 26, 2021
Dec. 27, 2020
Pension Benefits    
Projected benefit obligation $ 348,831 $ 364,272
Accumulated benefit obligation 338,346 349,429
Fair value of plan assets $ 96,354 $ 85,938