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Income Taxes - Schedule Of Effective Tax Rate Differs From The U.S. Federal Statutory Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Disclosure [Abstract] |  |  |
Income tax provision at statutory rate | $ 146,048 | $ 102,058 | $ 80,933
State taxes, net of federal benefit | 10,548 | 6,806 | 6,012
Effective Income Tax Rate Reconciliation, FDII, Amount | (28,036) | (30,086) | (19,886)
Tax impact of foreign earnings | 7,359 | 9,856 | (1,549)
Research and development and other credits | (14,748) | (17,654) | (19,763)
Stock-based and other compensation | 8,145 | 20,145 | 15,070
Other | (629) | (85) | 2,416
Income taxes (benefit) | $ 128,687 | $ 91,040 | $ 63,233

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