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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, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income tax provision at statutory rate	$ 102,058	$ 80,933	$ 81,257
State taxes, net of federal benefit	6,806	6,012	5,118
Tax impact of foreign operations	(20,230)	(21,435)	(26,881)
Research and development and other credits	(19,198)	(18,917)	(18,055)
Stock-based and other compensation	20,145	15,070	12,740
Other	1,459	1,570	1,517
Income taxes (benefit)	$ 91,040	$ 63,233	$ 55,696

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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