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Income Taxes - Summary of Income Before Income Tax Provision (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
(Loss) income before income tax provision:      
United States $ (52,357) $ 42,218 $ 130,535
Other 15,216 12,113 16,900
(Loss) income before income tax provision $ (37,141) $ 54,331 $ 147,435