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Stock-Based Compensation, Stock Option Activity (Details) - Stock Options [Member] - $ / shares	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Stock Options [Abstract]
Awards granted (in shares)	10,000	220,000
Estimated weighted average fair value for options granted and significant weighted average assumptions used [Abstract]
Weighted average fair value of options on grant date (in dollars per share)	$ 9.42	$ 11.80
Weighted Average Assumptions [Abstract]
Expected life of options (years)	5 years 10 months 24 days	6 years 3 months 18 days
Risk-free interest rate	0.50%	1.10%
Expected volatility	31.20%	30.60%
Expected dividend yield	3.00%	2.40%
Fair value of common stock on grant date (in dollars per share)	$ 45.99	$ 57.34
Exercise price of stock option grant (in dollars per share)	$ 45.99	$ 63.07
Maximum [Member]
Stock Options [Abstract]
Exercisable period	10 years
Vesting on April 30, 2023 or Anniversary Date [Member]
Stock Options [Abstract]
Award vesting percentage	10.00%
Vesting on April 30, 2024 or Anniversary Date [Member]
Stock Options [Abstract]
Award vesting percentage	20.00%
Vesting on April 30, 2025 or Anniversary Date [Member]
Stock Options [Abstract]
Award vesting percentage	30.00%
Vesting on April 30, 2026 or Anniversary Date [Member]
Stock Options [Abstract]
Award vesting percentage	40.00%

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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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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Net number of share options (or share units) granted during the period.

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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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Price of a single share of a number of saleable stocks of a company.

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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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