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Pension and Postretirement Benefit Obligations (Tables)
 9 Months Ended
Sep. 26, 2025
Retirement Benefits [Abstract]  
Summary of Components of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost
The components of net periodic pension cost were as follows:

Third QuarterFirst Nine Months
(in thousands)2025202420252024
Service cost$973 $1,092 $2,919 $3,274 
Interest cost653 588 1,959 1,765 
Expected return on plan assets(819)(762)(2,458)(2,287)
Recognized net actuarial gain(9)— (27)— 
Amortization of prior service costs4 4 12 12 
Net periodic pension cost$802 $922 $2,405 $2,764 
The components of net periodic postretirement benefit cost were as follows:

Third QuarterFirst Nine Months
(in thousands)2025202420252024
Service cost$323 $310 $969 $930 
Interest cost857 781 2,571 2,343 
Recognized net actuarial loss— 26 — 78 
Net periodic postretirement benefit cost$1,180 $1,117 $3,540 $3,351