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Stock-Based Compensation - Schedule of Weighted-Average Assumptions Used to Value Options (Details) - Stock options	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Assumptions:
Expected term (in years)	5 years 4 months 24 days	5 years 4 months 24 days	5 years 4 months 24 days
Expected volatility (as a percent)	34.10%	33.40%	34.50%
Risk-free interest rate (as a percent)	1.63%	2.87%	2.09%
Expected dividend yield (as a percent)	1.37%	1.50%	1.15%

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- References

No definition available.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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-Name Accounting Standards Codification
-Topic 718
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- Definition

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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