Pension and Postretirement Benefit Obligations - Summary of Components of Total Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 28, 2024	Jun. 30, 2023	Jun. 28, 2024	Jun. 30, 2023	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Settlement expense	$ 0	$ 39,777	$ 0	$ 39,777	$ 112,800
Total pension expense	921	42,448	1,842	45,118
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		1,100	2,182	2,199
Interest cost		3,508	1,177	7,016
Expected return on plan assets		(2,914)	(1,525)	(5,828)
Recognized net actuarial loss		973	0	1,946
Amortization of prior service cost		4	8	8
Net periodic postretirement benefit cost		$ 2,671	$ 1,842	$ 5,341
Pension Plans | Bargaining Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,091
Interest cost	588
Expected return on plan assets	(762)
Recognized net actuarial loss	0
Amortization of prior service cost	4
Net periodic postretirement benefit cost	$ 921