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Stock-Based Compensation (Details) - $ / shares	6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, number granted	932,678	1,347,310
Stock options, weighted average grant date fair value	$ 9.36	$ 7.29
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Expected life of option (years)	6 years 6 months	6 years 6 months
Risk-free interest rate	0.60%	1.67%
Expected volatility of the Company's stock	27.60%	22.40%
Expected dividend yield on the Company's stock	2.28%	2.49%
Stock options | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years
Stock options | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, number granted	35,254	0
Equity instruments other than options, weighted average grant date fair value	$ 9.36	$ 0
Restricted stock/units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, number granted	1,697,257	1,864,026
Equity instruments other than options, weighted average grant date fair value	$ 46.20	$ 41.55
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, number granted	410,934	476,939
Equity instruments other than options, weighted average grant date fair value	$ 50.53	$ 42.48
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Risk-free interest rate	0.20%	1.60%
Expected volatility of the Company's stock	30.90%	21.80%

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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