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Income Taxes (Unrecognized Tax Benefits, Additional Information) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
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Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 2,400 |  |  |
Unrecognized tax benefits | 2,600 | $ 1,713 | $ 1,561 | $ 1,335
Accrued income tax penalties and interest for unrecognized tax benefits | 100 | $ 100 |  |
Noncurrent income taxes payable |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | 1,900 |  |  |
Noncurrent deferred tax assets |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | 700 |  |  |
Maximum |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Decrease in unrecognized tax benefits that is reasonably possible | $ 100 |  |  |

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