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Income Taxes (Unrecognized Tax Benefits, Additional Information) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
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Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 1,400 |  |  |
Unrecognized tax benefits | 1,561 | $ 1,335 | $ 1,708 | $ 1,618
Accrued income tax penalties and interest for unrecognized tax benefits | 100 | $ 100 |  |
Noncurrent income taxes payable |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | 800 |  |  |
Noncurrent deferred tax assets |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | $ 800 |  |  |

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