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Stock-based Compensation Assumptions Used in Black-Scholes Option Valuation Model (Details)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Stock Based Compensation Activity [Line Items]
Risk-free interest rate	2.77%	2.28%
Employee Stock Option
Stock Based Compensation Activity [Line Items]
Expected life of option (years)	6 years 4 months 24 days	6 years 6 months
Risk-free interest rate, minimum			1.23%
Risk-free interest rate, maximum			1.93%
Expected volatility of the Company's stock	21.80%	23.70%	24.60%
Expected dividend yield on the Company's stock	3.29%	2.78%	2.21%
Employee Stock Option | Minimum
Stock Based Compensation Activity [Line Items]
Expected life of option (years)			4 years 272 days
Employee Stock Option | Maximum
Stock Based Compensation Activity [Line Items]
Expected life of option (years)			6 years 182 days

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- Definition

Stock Based Compensation Activity [Line Items]

+ References

No definition available.

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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.

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

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

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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