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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Sep. 28, 2019
--- | --- | ---
Deferred tax assets [Abstract] |  |
Net operating loss carryforwards | $ 38,217 | $ 38,914
Allowance for doubtful accounts | 156 | 170
Inventory | 250 | 231
Deferred revenue | 575 | 615
AMT credit carryforward | 0 | 513
Other accruals | 2,092 | 1,416
Total deferred tax assets | 41,290 | 41,859
Deferred tax liabilities [Abstract] |  |
Intangible assets | 1,197 | 1,205
Property, plant and equipment | 1,899 | 2,145
Total deferred tax liabilities | 3,096 | 3,350
Net deferred tax assets | 38,194 | 38,509
Valuation allowance | (37,698) | (37,996)
Net deferred tax assets | $ 496 | $ 513

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