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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Sep. 30, 2020
Income Taxes [Line Items] |  |
Gross unrecognized tax benefits | $ 13,314 | $ 9,851
Unrecognized tax benefits that, if recognized, would affect the effective tax rate | 7,349 |
Possible decrease in unrecognized tax benefits liability | $ 1,884 |
Domestic Tax Authority [Member] |  |
Income Taxes [Line Items] |  |
Year remaining open to tax examination | 2018 |
State and Local Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Year remaining open to tax examination | 2016 |
Foreign Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Year remaining open to tax examination | 2016 |

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