Employee Benefit Plans (Tables)

6 Months Ended

Jun. 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				Six months ended
	June 30, 2023		June 26, 2022		June 30, 2023		June 26, 2022
Pension and SERPA Benefits:
Service cost	$	1,294	$	4,763	$	2,588	$	9,525
Interest cost	20,476		15,472		40,952		30,945
Expected return on plan assets	(36,519)		(31,476)		(73,038)		(62,952)
Amortization of unrecognized:
Prior service cost (credit)	188		(328)		376		(656)
Net (gain) loss	(181)		7,978		(362)		15,956
Settlement gain	—		—		(222)		(256)
Net periodic benefit income	$	(14,742)	$	(3,591)	$	(29,706)	$	(7,438)
Postretirement Healthcare Benefits:
Service cost	$	797	$	1,161	$	1,594	$	2,322
Interest cost	2,772		1,904		5,544		3,808
Expected return on plan assets	(4,281)		(3,809)		(8,562)		(7,618)
Amortization of unrecognized:
Prior service credit	(166)		(581)		(332)		(1,162)
Net (gain) loss	(1,097)		122		(2,194)		244
Net periodic benefit income	$	(1,975)	$	(1,203)	$	(3,950)	$	(2,406)