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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |
Valuation allowance on deferred tax assets | $ 164,000 |  | $ 164,000 |  | $ 164,000
Income tax provision | $ 1,638,000 | $ 1,890,000 | $ 4,867,000 | $ 3,450,000 |
Effective income tax rate | 24.40% | 26.30% | 25.60% | 25.30% |

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