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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, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Settlements with tax authorities	[1]	$ 1,344	$ 10,245	$ 29,400
[1] The changes in the years ended September 30, 2021 and 2020 were $10,245 and $29,400 respectively, the majority of which were offset by income tax payments or changes in Tax receivables, Tax payables and deferred tax assets.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319

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