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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, 2023
Sep. 30, 2022
Sep. 30, 2021
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits, Beginning balance $ 213,031 $ 195,196 $ 168,186
Additions based on tax positions related to the current year 22,181 22,386 25,662
Additions for tax positions of prior years 18,477 8,359 23,849
Reduction for tax positions of prior years (16,096) (7,262) (7,467)
Settlements with tax authorities [1] (27,737) (1,344) (10,245)
Lapse of statute of limitations (12,907) (4,304) (4,789)
Unrecognized tax benefits, Ending balance $ 196,949 $ 213,031 $ 195,196
[1] The changes in the years ended September 30, 2023 and 2021 were $27,737 and $10,245 respectively, the majority of which were offset by income tax payments or changes in tax receivables and tax payables.