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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Sep. 28, 2019
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense | $ 5,822,000 | $ 4,249,000 | $ 9,262,000 | $ 7,038,000 |
Effective tax rate | (8.20%) | 36.50% | (13.50%) | 35.70% |
Statutory federal income tax rate | 21.00% | 35.00% | 21.00% | 35.00% |
Change in uncertain tax positions | $ 0 |  | $ (400,000) |  |
Scenario Forecast [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Change in uncertain tax positions |  |  |  |  | $ (200,000)

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