Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
Deferred tax assets:
Accounts receivable	$ 540	$ 1,195
Employment incentives	4,855	6,329
Self-insurance liability	9,155	8,717
Postretirement benefit obligations	6,565	5,963
Net operating loss and credit carryforwards	2,153	5,009
Unrecognized tax benefits	1,341	2,869
174 R&D Capitalization	2,307	426
Other	683	675
Total deferred tax assets	27,599	31,183
Deferred tax liabilities:
Inventories	(12,225)	(13,398)
Unrealized gains on marketable securities	(554)	1,280
Prepaids	(6,290)	(5,570)
Depreciation	(126,621)	(124,720)
Total deferred tax liabilities	(145,690)	(142,408)
Net deferred tax liability	$ (118,091)	$ (111,225)