Employee Benefit Plans (Tables)

6 Months Ended

Jun. 26, 2022

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 26, 2022		June 27, 2021		June 26, 2022		June 27, 2021
Pension and SERPA Benefits:
Service cost	$	4,763	$	6,348	$	9,525	$	12,696
Interest cost	15,472		15,472		30,945		30,942
Expected return on plan assets	(31,476)		(32,720)		(62,952)		(65,440)
Amortization of unrecognized:
Prior service credit	(328)		(312)		(656)		(624)
Net loss	7,978		18,386		15,956		36,772
Settlement (gain) loss	—		—		(256)		816
Net periodic benefit (income) cost	$	(3,591)	$	7,174	$	(7,438)	$	15,162
Postretirement Healthcare Benefits:
Service cost	$	1,161	$	1,288	$	2,322	$	2,576
Interest cost	1,904		1,626		3,808		3,252
Expected return on plan assets	(3,809)		(3,495)		(7,618)		(6,990)
Amortization of unrecognized:
Prior service credit	(581)		(581)		(1,162)		(1,162)
Net loss	122		264		244		528
Net periodic benefit income	$	(1,203)	$	(898)	$	(2,406)	$	(1,796)