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Pension and Other Postretirement Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2025
Mar. 31, 2024
Pension Obligations    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 762 $ 748
Interest cost 3,768 3,676
Expected return on plan assets (3,824) (4,047)
Amortization of prior service cost 37 45
Actuarial losses (gains) 319 (26)
Net periodic benefit cost 1,062 396
Other Postretirement Obligations    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 7 10
Interest cost 223 238
Expected return on plan assets 0 0
Amortization of prior service cost 0 0
Actuarial losses (gains) (82) (117)
Net periodic benefit cost $ 148 $ 131