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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2019
Income Taxes [Line Items] |  |
Gross unrecognized tax benefits | $ 11,613 | $ 10,305
Unrecognized tax benefits that, if recognized, would affect the effective tax rate | 5,022 |
Accrued interest and penalties | $ 541 | $ 437
Domestic Tax Authority [Member] |  |
Income Taxes [Line Items] |  |
Year remaining open to tax examination | 2017 |
Internal Revenue Service (IRS) [Member] |  |
Income Taxes [Line Items] |  |
Year under examination | 2017 |
State and Local Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Year remaining open to tax examination | 2015 |
Foreign Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Year remaining open to tax examination | 2016 |

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