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Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Income Tax Disclosure [Abstract]    
Unrecognized tax benefits at the beginning of the year $ 5,833  
Increases in tax positions for prior years   $ 5,837
Decreases in tax positions for prior years (1,748) (4)
Unrecognized tax benefits at the end of the year $ 4,085 $ 5,833