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Stock-Based Compensation, Stock Option Activity (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 61 Months Ended |
--- | --- | --- | ---
Oct. 31, 2021 | Apr. 30, 2021 | Apr. 30, 2019
Stock Options [Abstract] |  |  |
Awards granted (in shares) | 260,000 | 0 |
Significant Assumptions Used in Fair Value Determination [Abstract] |  |  |
Weighted average fair value of options on grant date (in dollars per share) | $ 11.71 |  |
Weighted Average Assumptions [Abstract] |  |  |
Expected life of options (years) | 6 years 3 months 18 days |  |
Risk-free interest rate | 1.10% |  |
Expected volatility | 30.70% |  |
Expected dividend yield | 2.40% |  |
Fair value of common stock on grant date (in dollars per share) | $ 56.79 |  |
Exercise price of stock option grant (in dollars per share) | $ 62.36 |  |
Unrecognized share-based compensation expense remaining |  |  | $ 0
Maximum [Member] |  |  |
Stock Options [Abstract] |  |  |
Exercisable period | 10 years |  |
Vesting on April 30, 2022 [Member] |  |  |
Stock Options [Abstract] |  |  |
Award vesting percentage | 10.00% |  |
Vesting on April 30, 2023 [Member] |  |  |
Stock Options [Abstract] |  |  |
Award vesting percentage | 20.00% |  |
Vesting on April 30, 2024 [Member] |  |  |
Stock Options [Abstract] |  |  |
Award vesting percentage | 30.00% |  |
Vesting on April 30, 2025 [Member] |  |  |
Stock Options [Abstract] |  |  |
Award vesting percentage | 40.00% |  |

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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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