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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 25, 2021 | Sep. 26, 2020
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Deferred tax assets [Abstract] |  |
Net operating loss carryforwards | $ 37,806 | $ 38,217
Allowance for doubtful accounts | 208 | 156
Inventory | 264 | 250
Deferred revenue | 557 | 575
Other accruals | 2,671 | 2,092
Total deferred tax assets | 41,506 | 41,290
Deferred tax liabilities [Abstract] |  |
Intangible assets | 1,189 | 1,197
Property, plant and equipment | 1,655 | 1,899
Total deferred tax liabilities | 2,844 | 3,096
Net deferred tax assets | 38,662 | 38,194
Valuation allowance | (38,268) | (37,698)
Net deferred tax assets | $ 394 | $ 496

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