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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Unrecognized tax benefits that would impact effective tax rate | $ 2,700 |
Income tax benefit specific to the period | (2,200) | $ 800
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |
Unrecognized tax benefits, beginning balance | 2,908 |
Decreases related to expiration of statute of limitations | (68) |
Unrecognized tax benefits, ending balance | 2,840 |
Maximum |  |
Unrecognized tax benefits that would decrease next twelve months | $ 700 |

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