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Income Taxes (Reconciliation of U.S Statutory Rate to Effective Tax Rate) (Details) | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Income Tax Disclosure [Abstract] |  |  |
Statutory tax rate | 21.00% | 21.00% | 21.00%
State income taxes, net of federal tax benefit | 0.30% | (0.40%) | (1.60%)
Taxes on international activities | 0.40% | (0.80%) | (0.60%)
Research credit | (1.20%) | (2.10%) | (3.90%)
Net excess income tax benefit from stock-based compensation | (3.50%) | (3.00%) | (3.70%)
Adjustments of prior period tax items | 0.40% | 0.90% | (1.30%)
Compensation and benefits | 0.30% | 0.80% | 0.60%
Distributable foreign earnings | 0.30% | 1.40% | 4.60%
German tax rate change | (2.60%) |  |
Other items, net | (0.20%) | 0.00% | 0.60%
Effective tax rate | 15.20% | 17.80% | 15.70%

X
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