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Income Taxes - Summary of the significant components of the company's net deferred tax assets (Detail) - USD ($) $ in Thousands | Sep. 25, 2021 | Sep. 26, 2020
--- | --- | ---
Deferred tax assets: |  |
Non-capital loss carry-forward | $ 11,265 | $ 11,794
R&D credits and deductible expenditures | 1,993 | 1,696
Fixed assets | 37 | 0
Other | 1 | 1
Gross deferred tax assets | 13,296 | 13,491
Deferred tax liabilities: |  |
R&D credits and deductible expenditures | (688) | (600)
Fixed assets | 0 | (17)
Gross deferred tax liabilities | (688) | (617)
Total deferred tax assets and liabilities | 12,608 | 12,874
Valuation allowance | (12,608) | (12,874)
Net deferred tax assets | $ 0 | $ 0

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