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Income Taxes - Summary of Tax Rates (Detail) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Disclosure [Abstract] |  |  |
Federal tax provision | 21.00% | 21.00% | 21.00%
State taxes, net of federal benefit | 3.60% | 3.40% | 3.70%
Stock-based compensation | (0.20%) | (0.60%) | (0.70%)
Foreign rate differential | 0.20% |  | 0.10%
US tax on foreign earnings | 1.40% |  |
Equity Investment | (0.90%) |  |
Other | 0.60% | 0.60% | 0.60%
Effective tax rate | 25.70% | 24.40% | 24.70%

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