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Stock-Based Compensation, Director Stock Awards (Details) - Director Stock Plan [Member] - Class A Common Stock [Member] - Non-Employee Directors [Member] - shares | 12 Months Ended
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Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020
Deferred Compensation Arrangement With Individual Share Based Payments [Abstract] |  |  |
Value of annual award as percentage of annual director retainer fee based on stock price on date of grant | 100.00% |  |
Shares awarded under the plan (in shares) | 18,384 | 28,360 | 20,048

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- Definition The value of the annual award of Class A Common Stock received by each non-employee director as a percentage of the annual director fee, based on the stock price on the date of grant. + References No definition available. + Details
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- Definition Number of shares issued pursuant to the terms of a deferred compensation 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 (l) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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