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Equity Compensation Plans (Tables)
 3 Months Ended
Aug. 31, 2019
Stock Option Activity A summary of stock option activity during the three months ended August 31, 2019 follows:
                 
 
   
Weighted-
 
 
   
Average
 
(Options in thousands)
 
Shares
      
Exercise Price
 
Options outstanding June 1, 2019
   
2,385
    $
49.37
 
Granted
   
—
     
—
 
Exercised
   
(196
)    
41.51
 
Forfeited
   
(6
)    
62.70
 
                 
Options outstanding August 31, 2019
   
2,183
    $
50.04
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fair Value of Stock Options Granted, Estimated using Weighted-Average Assumptions The fair value of stock options granted was estimated using the following weighted-average assumptions.
         
 
FY 2019
 
Risk-free interest rate
   
2.6
 %
Expected dividend yield
   
0.0
 %
Expected stock price volatility
   
27.0
 %
Expected option life
   
3.5 years