Pension and Postretirement Benefit Obligations - Summary of Components of Total Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Dec. 31, 2023	Sep. 29, 2023
Defined Benefit Plan Disclosure [Line Items]
Settlement expense	$ 0	$ 77,319	$ 0	$ 112,800	$ 117,096
Total pension expense	922	78,330	2,764		123,448
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		1,099			3,298
Interest cost		517			7,533
Expected return on plan assets		(609)			(6,437)
Recognized net actuarial loss		0			1,946
Amortization of prior service cost		4			12
Net periodic postretirement benefit cost		$ 1,011			$ 6,352
Pension Plans | Bargaining Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,092		3,274
Interest cost	588		1,765
Expected return on plan assets	(762)		(2,287)
Recognized net actuarial loss	0		0
Amortization of prior service cost	4		12
Net periodic postretirement benefit cost	$ 922		$ 2,764