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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 26, 2022
Mar. 27, 2021
Pension    
Defined Benefit Plans Disclosure [Line Items]    
Service cost $ 2,176 $ 2,551
Interest cost 4,606 4,418
Expected return on plan assets (8,328) (9,623)
Amortization of prior service cost 39 176
Amortization of losses 2,473 4,079
Total net periodic benefit cost 966 1,601
Postretirement    
Defined Benefit Plans Disclosure [Line Items]    
Service cost 353 362
Interest cost 216 176
Expected return on plan assets 0 0
Amortization of prior service cost (31) (38)
Amortization of losses 15 3
Total net periodic benefit cost $ 553 $ 503