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CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - $ / shares
shares in Thousands
Apr. 30, 2022
Apr. 30, 2021
Shareholders' equity    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred stock, shares authorized (in shares) 2,000 2,000
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) 180,000 180,000
Common stock, shares issued (in shares) 70,226 70,208
Treasury shares at cost (in shares) 23,515 23,419
Class B [Member]    
Shareholders' equity    
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 72,000 72,000
Common stock, shares issued (in shares) 12,956 12,974
Treasury shares at cost (in shares) 3,924 3,922