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Income Taxes - Aggregate Changes in Balance of Company's Gross Unrecognized Tax Benefits (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Settlements with tax authorities	[1]	$ 27,737	$ 1,344	$ 10,245
[1] The changes in the years ended September 30, 2023 and 2021 were $27,737 and $10,245 respectively, the majority of which were offset by income tax payments or changes in tax receivables and tax payables.

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- References

No definition available.

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- Definition

Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15A
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A

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