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Shareholders' Equity - Changes in Certain Components of Shareholders' Equity (Detail II) - $ / shares | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Stockholders' Equity Note [Abstract] |  |  |
Common stock dividend per share (USD per share) | $ 3.48 | $ 3.32 | $ 3.16

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- References No definition available. + Details
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