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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
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income tax provision at statutory rate	$ 169,750	$ 146,048	$ 102,058
State taxes, net of federal benefit	11,724	10,548	6,806
Effective Income Tax Rate Reconciliation, FDII, Amount	(32,192)	(28,036)	(30,086)
Tax impact of foreign earnings	(9,922)	7,359	9,856
Research and development and other credits	(24,467)	(14,748)	(17,654)
Stock-based and other compensation	(2,635)	8,145	20,145
Other	3,698	(629)	(85)
Income taxes (benefit)	$ 115,956	$ 128,687	$ 91,040

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