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Income Taxes - Aggregate Changes in Balance of Company's Gross Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits, Beginning balance $ 151,822 $ 196,949 $ 213,031
Additions based on tax positions related to the current year 23,112 23,267 22,181
Additions for tax positions of prior years 22,751 15,840 18,477
Reductions for tax positions of prior years (3,486) (4,613) (16,096)
Settlements with tax authorities [1] (7,040) (48,622) (27,737)
Lapse of statute of limitations (16,627) (30,999) (12,907)
Unrecognized tax benefits, Ending balance $ 170,532 $ 151,822 $ 196,949
[1] The changes in the years ended September 30, 2024 and 2023 were $48,622 and $27,737 respectively, the majority of which were offset by income tax payments or changes in tax receivables and tax payables.