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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
May 31, 2019
May 31, 2018
CONSOLIDATED BALANCE SHEETS    
Preferred stock, par value (in dollars per share) $ 1.00 $ 1.00
Preferred stock, authorized shares 250,000 250,000
Preferred stock, issued shares 0 0
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, authorized shares 100,000,000 100,000,000
Common stock, issued shares 45,300,786 45,300,786
Treasury stock, shares 10,512,974 10,585,165