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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)

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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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