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CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION - UNAUDITED (Parenthetical) - $ / shares	Jul. 31, 2019	Apr. 30, 2019
Shareholders' Equity
Preferred Stock, par value (in dollars per share)	$ 1	$ 1
Preferred Stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred Stock, shares issued (in shares)	0	0
Class A [Member]
Shareholders' Equity
Common Stock, par value (in dollars per share)	$ 1	$ 1
Common Stock, shares authorized (in shares)	180,000,000	180,000,000
Common Stock, shares issued (in shares)	70,138,555	70,126,963
Treasury stock (in shares)	22,795,256	22,633,869
Class B [Member]
Shareholders' Equity
Common Stock, par value (in dollars per share)	$ 1	$ 1
Common Stock, shares authorized (in shares)	72,000,000	72,000,000
Common Stock, shares issued (in shares)	13,043,115	13,054,707
Treasury stock (in shares)	3,917,574	3,917,574

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Face amount or stated value per share of common stock.

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-SubTopic 10
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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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