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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
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
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)	18,991	19,900	20,243

X

- 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.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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=109197908&loc=d3e5070-113901

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