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Stock-Based Compensation, Stock Option Activity (Details) - Stock Options [Member] - $ / shares | 3 Months Ended
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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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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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