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Stock-based Compensation Plans - Summary of Stock Option Grant Activity (Detail) - Stock Option Awards [Member] - $ / shares | 6 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Stock options granted | 283,000 | 234,000
Weighted average grant date fair value | $ 16.36 | $ 13.86
Weighted average exercise price | $ 43.72 | $ 38.65

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- Definition 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. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Details
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