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CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - $ / shares
Apr. 30, 2017
Apr. 30, 2016
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) 70,086,003 69,797,994
Treasury Shares At Cost (in shares) 22,096,970 21,708,905
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) 13,095,667 13,392,268
Treasury Shares At Cost (in shares) 3,917,574 3,917,128