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Income Taxes - Uncertain Tax Positions (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Gross unrecognized tax benefits, beginning balance $ 83 $ 108
Increase in current year tax positions 108 0
Increase in prior year tax positions 73 0
Settlements and other reductions 26 25
Gross unrecognized tax benefits, ending balance $ 238 $ 83