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Income Taxes - Aggregate Changes in Balance of Company's Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, Beginning balance	$ 169,322	$ 187,646	$ 193,024
Additions based on tax positions related to the current year	23,154	19,530	20,329
Additions for tax positions of prior years	23,292	27,558	6,743
Reduction for tax positions of prior years	(15,214)	(2,578)	(10,548)
Settlements with tax authorities	(29,400)	(37,672)	(3,880)
Lapse of statute of limitations	(2,968)	(25,162)	(18,022)
Unrecognized tax benefits, Ending balance	$ 168,186	$ 169,322	$ 187,646

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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