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Income Taxes - Schedule of Reconciliation of Total Amounts of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Income Tax Uncertainties [Abstract]      
Unrecognized tax benefits beginning balance $ 4,866 $ 4,866 $ 4,688
Gross decreases — tax positions in prior period 0 0 0
Gross increases — tax positions in prior period 0 0 178
Unrecognized tax benefits ending balance $ 4,866 $ 4,866 $ 4,866