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Pension and Other Postretirement Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 29, 2026
Mar. 30, 2025
Pension Obligations    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 808 $ 762
Interest cost 3,909 3,768
Expected return on plan assets (4,031) (3,824)
Amortization of prior service cost 79 37
Actuarial losses (gains) 355 319
Net periodic benefit cost 1,120 1,062
Other Postretirement Obligations    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 8 7
Interest cost 228 223
Expected return on plan assets 0 0
Amortization of prior service cost 0 0
Actuarial losses (gains) (84) (82)
Net periodic benefit cost $ 152 $ 148