Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 27, 2025	Dec. 28, 2024
Deferred tax assets:
Inventories	$ 17,173	$ 17,296
Other postretirement benefits and accrued items	14,158	16,202
Other reserves	7,570	6,870
Foreign tax attributes	4,696	4,676
State tax attributes, net of federal benefit	2,459	3,932
Stock-based compensation	4,834	5,100
Lease liability	5,656	6,230
Basis difference in unconsolidated affiliates	10,552	11,649
Total deferred tax assets	67,098	71,955
Less valuation allowance	(15,686)	(16,692)
Deferred tax assets, net of valuation allowance	51,412	55,263
Deferred tax liabilities:
Property, plant, and equipment	52,166	52,405
Lease asset	6,044	6,670
Other liabilities	15,284	10,198
Total deferred tax liabilities	73,494	69,273
Net deferred tax liabilities	$ (22,082)	$ (14,010)