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Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Detail)
$ in Thousands
12 Months Ended
Sep. 30, 2023
USD ($)
Income Tax Disclosure [Abstract]  
Unrecognized tax benefits at the beginning of the year $ 5,800
Increases in tax positions for prior years 5,837
Decreases in tax positions for prior years (4)
Unrecognized tax benefits at the end of the year $ 5,833