Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Income Tax Disclosure [Abstract] | |||
| Gross liability for unrecognized tax benefits | $ 353 | $ 608 | $ 608 |
| Unrecognized tax benefits that would impact effective tax rate | 300 | 500 | |
| Net liability for accrued interest and penalties | 300 | 300 | |
| Interest and penalty expenses on unrecognised tax benefit | $ 20 | $ 30 | |