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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Class A [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock dividend (in dollars per share)	$ 1.32	$ 1.28	$ 1.24
Class B [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock dividend (in dollars per share)	$ 1.32	$ 1.28	$ 1.24

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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