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Share-Based Compensation - Equity Incentive Plan Activity (Parenthetical) (Detail) - $ / shares shares in Thousands | 12 Months Ended |
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Sep. 30, 2025 | Sep. 30, 2024
Share-Based Payment Arrangement [Abstract] |  |
Stock options outstanding include options vested and expected to vest in the future, weighted average remaining contractual life, in years | 5 years 5 months 23 days |
Unvested stock options | 283,000 | 373,000
Unvested stock options, weighted average grant date fair value | $ 89.84 | $ 70.24

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