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CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION - UNAUDITED (Parenthetical) - $ / shares
Jul. 31, 2018
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) 70,114,603 70,110,603
Treasury stock (in shares) 21,721,960 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) 13,067,067 13,071,067
Treasury stock (in shares) 3,917,574 3,917,574