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Stock Option and Incentive Plan - Assumptions Used in Calculating Fair Value of Options (Detail) - $ / shares

12 Months Ended

Sep. 30, 2020

Sep. 30, 2019

Sep. 30, 2018

Disclosure of Stock Option and Incentive Plan [Abstract]

Risk-free interest rate

^[1]

1.41%

2.64%

2.30%

Expected life of stock options

^[2]

4 years 6 months

4 years 6 months

4 years 6 months

Expected volatility

^[3]

17.30%

17.80%

15.00%

Expected dividend yield

^[4]

1.75%

1.82%

1.51%

Fair value per option

$ 8.85

$ 9.13

$ 8.70

[1]	Risk-free interest rate is based upon U.S. Treasury yield curve appropriate for the term of the Company’s employee stock options.
[2]	Expected life of stock options is based upon historical experience.
[3]	Expected volatility is based on blended volatility.
[4]	Expected dividend yield is based on the Company’s history and future expectation of dividend payouts.

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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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