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Equity-based Compensation - Assumptions Used in Calculating Fair Value of Options (Detail) - $ / shares | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2021
ESPP [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Risk-free interest rate | [1],[2] | 5.46% |
Expected life of stock options | [2],[3] | 6 months |
Expected volatility | [2],[4] | 18.40% |
Expected dividend yield | [2],[5] | 1.84% |
Fair value per option | [2] | $ 19.35 |
Stock Option [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Risk-free interest rate | [1],[2] |  | 0.30%
Expected life of stock options | [2],[3] |  | 4 years 6 months
Expected volatility | [2],[4] |  | 21.30%
Expected dividend yield | [2],[5] |  | 2.22%
Fair value per option | [2] |  | $ 7.82
[1] | Risk-free interest rate is based upon U.S. Treasury yield curve appropriate for the term of the Company’s employee stock options and ESPP.
[2] | There were no stock options grants during fiscal years 2023 and 2022, and the above stock option weighted average assumptions were applicable when calculating the fair value of options granted in fiscal year 2021.
[3] | Expected life of stock options is based upon historical experience. Expected life of ESPP is based upon the purchase period.
[4] | Expected volatility is based on blended volatility
[5] | Expected dividend yield is based on the Company’s history and future expectation of dividend payouts

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Line items represent financial concepts included in a table. 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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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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