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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($)	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative-effect adjustment to retained earnings	$ 484,297,000	$ 457,859,000	$ 438,191,000		$ 425,868,000
Accounting Standards Update 2016-02 [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative-effect adjustment to retained earnings				$ 0

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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