Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Deferred tax assets [Abstract]
Inventories	$ 12,297	$ 10,598
Other postretirement benefits and accrued items	9,213	9,239
Other reserves	7,847	9,029
Federal and foreign tax attributes	6,252	11,936
State tax attributes, net of federal benefit	27,651	29,720
Stock-based compensation	2,949	2,102
Basis difference in unconsolidated affiliates	1,067	0
Total deferred tax assets	67,276	72,624
Less valuation allowance	(25,311)	(30,316)
Deferred tax assets, net of valuation allowance	41,965	42,308
Deferred tax liabilities:
Property, plant, and equipment	44,910	43,972
Pension	250	3,841
Basis difference in unconsolidated affiliates	0	203
Total deferred tax liabilities	45,160	48,016
Net deferred tax liabilities	$ (3,195)	$ (5,708)

The cumulative amount of future tax effects arising from the unused tax credit carryforward that cannot be utilized on the tax return during a year that may be carried forward to reduce taxable income or taxes payable in a future year; a tax credit carryforward is the amount by which tax credits available for utilization exceed statutory limitations.

No definition available.