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Retirement Benefits
 6 Months Ended
Jun. 26, 2020
Defined Benefit Plan [Abstract]  
Retirement Benefits Retirement Benefits
The components of net periodic benefit cost for retirement benefit plans were as follows (in thousands):
 Three Months EndedSix Months Ended
 June 26,
2020		June 28,
2019		June 26,
2020		June 28,
2019
Pension Benefits
Service cost
$2,193  $1,635  $4,615  $3,644  
Interest cost
3,227  3,572  6,634  7,310  
Expected return on assets
(4,651) (4,216) (9,401) (8,575) 
Amortization and other
2,517  1,838  5,238  3,817  
Net periodic benefit cost
$3,286  $2,829  $7,086  $6,196  
Postretirement Medical
Service cost
$130  $123  $305  $273  
Interest cost
260  264  508  581  
Amortization
190  29  367  137  
Net periodic benefit cost
$580  $416  $1,180  $991