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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 28, 2019 | Sep. 29, 2018 | [1]
--- | --- | --- | ---
Deferred tax assets [Abstract] |  |
Net operating loss carryforwards | $ 38,914 | $ 38,672
Allowance for doubtful accounts | 170 | 225
Inventory | 231 | 291
Deferred revenue | 615 | 661
AMT credit carryforward | 513 | 1,086
Other accruals | 1,416 | 1,661
Total deferred tax assets | 41,859 | 42,596
Deferred tax liabilities [Abstract] |  |
Intangible assets | 1,205 | 1,131
Property, plant and equipment | 2,145 | 2,498
Total deferred tax liabilities | 3,350 | 3,629
Net deferred tax assets | 38,509 | 38,967
Valuation allowance | (37,996) | (37,881)
Net deferred tax assets | $ 513 | $ 1,086
[1] | As described above, federal net deferred tax assets of the Corporate Entities were remeasured, pursuant to the 2017 Act, using the new 21% federal income tax rate and the full valuation allowance was adjusted accordingly.

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