Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Costs

Components of net periodic benefit (income) cost for the Company's defined benefit plans were as follows (in thousands):

	Three months ended				Nine months ended
	September 30, 2023		September 25, 2022		September 30, 2023		September 25, 2022
Pension and SERPA Benefits:
Service cost	$	1,294	$	4,763	$	3,882	$	14,289
Interest cost	20,476		15,473		61,429		46,418
Expected return on plan assets	(36,519)		(31,476)		(109,557)		(94,428)
Amortization of unrecognized:
Prior service cost (credit)	188		(328)		564		(984)
Net (gain) loss	(181)		7,978		(543)		23,934
Settlement gain	—		—		(222)		(256)
Net periodic benefit income	$	(14,742)	$	(3,590)	$	(44,447)	$	(11,027)
Postretirement Healthcare Benefits:
Service cost	$	797	$	1,161	$	2,390	$	3,482
Interest cost	2,772		1,904		8,316		5,712
Expected return on plan assets	(4,281)		(3,809)		(12,843)		(11,427)
Amortization of unrecognized:
Prior service credit	(166)		(581)		(498)		(1,743)
Net (gain) loss	(1,097)		122		(3,291)		366
Net periodic benefit income	$	(1,975)	$	(1,203)	$	(5,926)	$	(3,610)