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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018
Income Taxes [Line Items] |  |  |  |  |  |
Valuation allowance on deferred tax assets | $ 119,000 |  |  | $ 119,000 |  | $ 119,000
Income tax provision | $ 6,719,000 | $ 6,723,000 |  | $ 10,169,000 | $ 10,582,000 |
Effective income tax rate | 26.00% | 27.90% |  | 25.80% | 27.60% |
Federal corporate tax rate |  |  | 35.00% | 21.00% |  |
Tax Cuts and Jobs Act [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Reduction in beginning deferred tax assets |  |  |  |  | $ 889,000 |
Increase in income tax provision |  |  |  |  | $ 889,000 |

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