Retirement Benefits (Tables)

6 Months Ended

Jul. 01, 2022

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost for retirement benefit plans were as follows (in thousands):

	Three Months Ended				Six Months Ended
	July 1, 2022		June 25, 2021		July 1, 2022		June 25, 2021
Pension Benefits
Service cost	$	1,964	$	2,724	$	4,134	$	5,445
Interest cost	2,766		2,976		5,504		5,957
Expected return on assets	(4,777)		(5,131)		(9,579)		(10,261)
Amortization and other	1,419		2,555		2,495		5,106
Net periodic benefit cost	$	1,372	$	3,124	$	2,554	$	6,247
Postretirement Medical
Service cost	$	83	$	175	$	258	$	350
Interest cost	195		250		420		500
Amortization	(2)		250		173		500
Net periodic benefit cost	$	276	$	675	$	851	$	1,350