Share-based Compensation - Summary of Performance-based Shares Activity (Detail) $ / shares in Units, $ in Millions	12 Months Ended
Sep. 30, 2023 USD ($) $ / shares shares
Aggregate Intrinsic Value
Stock price used to calculate aggregate intrinsic value (in dollars per share)	$ 230.01
Performance-based Shares
Shares
Beginning balance (in shares) \| shares	834,196
Granted (in shares) \| shares	551,818
Vested and earned (in shares) \| shares	(219,523)
Unearned (in shares) \| shares	(167,989)
Ending balance (in shares) \| shares	998,502
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 199.92
Granted (in dollars per share)	221.32
Vested and earned (in dollars per share)	201.70
Unearned (in dollars per share)	194.42
Ending balance (in dollars per share)	$ 212.28
Weighted- Average Remaining Contractual Term (in years)
Outstanding as of September 30, 2023	1 year
Aggregate Intrinsic Value
Outstanding as of September 30, 2023 \| $	$ 230

No definition available.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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-Topic 718
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Subparagraph (e)(1)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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- Definition

Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Unearned

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Unearned, Weighted Average Grant Date Fair Value

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