Other Postretirement Benefits - Changes in the Benefit Obligation and Plan Assets and Other Amounts (Details) - Other Postretirement Benefit Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 26, 2021
Change in benefit obligation
Benefit obligation at beginning of year	$ 30,696	$ 40,607
Service cost	33	46	$ 53
Interest cost	1,500	731	565
Plan participants’ contributions	2,060	2,271
Actuarial (gain)	(6,916)	(6,801)
Benefits paid	(4,461)	(6,158)
Benefit obligation at end of year	22,912	30,696	$ 40,607
Change in plan assets
Fair value of plan assets at beginning of year	0
Employer contributions	2,401	3,887
Plan participants’ contributions	2,060	2,271
Benefits paid	(4,461)	(6,158)
Fair value of plan assets at end of year	0	0
Amount recognized in the Consolidated Balance Sheets
Current liabilities	(3,510)	(4,241)
Noncurrent liabilities	(19,402)	(26,455)
Net amount recognized	(22,912)	(30,696)
Amount recognized in accumulated other comprehensive loss
Actuarial loss	6,676	15,537
Prior service credit	0	0
Total	$ 6,676	$ 15,537