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Pension and Postretirement Benefit Obligations (Tables)
 9 Months Ended
Sep. 27, 2024
Retirement Benefits [Abstract]  
Summary of Components of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost
The components of total pension expense were as follows:

Third QuarterFirst Nine Months
(in thousands)2024202320242023
Service cost$1,092 $1,099 $3,274 $3,298 
Interest cost588 517 1,765 7,533 
Expected return on plan assets(762)(609)(2,287)(6,437)
Recognized net actuarial loss— — — 1,946 
Amortization of prior service cost4 4 12 12 
Net periodic pension cost922 1,011 2,764 6,352 
Settlement expense— 77,319 — 117,096 
Total pension expense$922 $78,330 $2,764 $123,448 
The components of net periodic postretirement benefit cost were as follows:

Third QuarterFirst Nine Months
(in thousands)2024202320242023
Service cost$310 $294 $930 $882 
Interest cost781 697 2,343 2,092 
Recognized net actuarial loss26 — 78 — 
Net periodic postretirement benefit cost$1,117 $991 $3,351 $2,974