Income Taxes - Schedule Of Provision For Income Taxes (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Current, U.S. federal	$ 115,170	$ 35,259	$ 53,107
Current, State	18,359	14,592	16,686
Current, Foreign	66,053	54,079	62,832
Total	199,582	103,930	132,625
Deferred, U.S. federal	(89,280)	(28,721)	(61,739)
Deferred, State	(18,576)	(11,332)	(15,294)
Deferred, Foreign	(686)	(644)	104
Total	(108,542)	(40,697)	(76,929)
Income taxes (benefit)	$ 91,040	$ 63,233	$ 55,696

Amount of current federal tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, current national tax expense (benefit) for non-US (United States of America) jurisdiction.

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