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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits, beginning balance $ 2,600 $ 1,713 $ 1,561
Increases related to prior year income tax positions 40 756 9
Increases related to current year income tax positions 507 425 314
Decreases related to prior year income tax positions (155) 0 (34)
Decreases related to settlements 0 (7) 0
Decreases related to expiration of statute of limitations (84) (287) (137)
Unrecognized tax benefits, ending balance $ 2,908 $ 2,600 $ 1,713