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Income Taxes - Schedule of Reconciliation of Total Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Income Tax Uncertainties [Abstract] |  |
Unrecognized tax benefits beginning balance | $ 4,866 | $ 4,866
Gross decreases — tax positions in prior period | 0 | 0
Gross increases — tax positions in prior period | 0 | 0
Unrecognized tax benefits ending balance | $ 4,866 | $ 4,866

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