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Retirement Benefits
 3 Months Ended
Mar. 29, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Retirement Benefits Retirement Benefits
The components of net periodic benefit cost for retirement benefit plans were as follows (in thousands):
 Three Months Ended
 March 29,
2024		March 31,
2023
Pension Benefits
Service cost
$1,467 $1,464 
Interest cost
2,430 3,777 
Expected return on assets
(2,444)(3,975)
Amortization and other
936 440 
Net periodic benefit cost
$2,389 $1,706 
Postretirement Medical
Service cost
$100 $100 
Interest cost
300 210 
Amortization
(25)90 
Net periodic benefit cost
$375 $400