Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Deferred tax assets:
Accounts receivable	$ 794	$ 540
Employment incentives	4,300	4,855
Self-insurance liability	9,283	9,155
Postretirement benefit obligations	6,454	6,565
Net operating loss and credit carryforwards	1,533	2,153
Unrecognized tax benefits	549	1,341
174 R&D Capitalization	6,411	2,307
Other	116	683
Total deferred tax assets	29,440	27,599
Deferred tax liabilities:
Inventories	(11,811)	(12,225)
Unrealized gains on marketable securities	(223)	(554)
Prepaids	(9,895)	(6,290)
Nondeductible accruals and other	382
Depreciation	(120,042)	(126,621)
Total deferred tax liabilities	(141,589)	(145,690)
Net deferred tax liability	$ (112,149)	$ (118,091)