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CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - $ / shares	Apr. 30, 2019	Apr. 30, 2018
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)	70,126,963	70,110,603
Treasury stock (in shares)	22,633,869	21,853,257
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)	13,054,707	13,071,067
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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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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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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