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The Incentive Stock Plans - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Options granted |  | 5,000 | 0 |
Total intrinsic value of options exercised |  | $ 0.1 | $ 1.4 | $ 0.8
Incentive Stock Plan 2021 [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Increase in total number of available shares | 1,300,000 |  |  |
Incentive Stock Plan 2021 [Member] | Subject To Award [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock, shares authorized |  |  | 2,300,000 |
Incentive Stock Plan 2011 [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of Common stock shares available |  |  | 545,729 |

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