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Income Taxes - Summary of Tax Rates (Detail) | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Disclosure [Abstract] |  |  |
Federal tax provision | 21.00% | 21.00% | 21.00%
State taxes, net of federal benefit | 3.00% | 3.60% | 3.40%
Stock-based compensation | 4.20% | (0.20%) | (0.60%)
Foreign rate differential | (2.00%) | 0.20% |
US tax on foreign earnings | 1.50% | 1.40% |
Equity investment |  | (0.90%) |
Other | 1.00% | 0.60% | 0.60%
Effective tax rate | 28.70% | 25.70% | 24.40%

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