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Equity Compensation Plans (Tables)
 3 Months Ended
Aug. 31, 2020
Stock Option Activity A summary of stock option activity during the three months ended August 31, 2020 follows:
 
           
Weighted-
  
           
Average
  
(Options in thousands)
   
Shares
     
Exercise Price
  
Options outstanding June 1, 2020
      2,162      $ 55.96  
Granted
      —        —  
Exercised
      (86 )       48.39  
Forfeited
      (7 )       57.81  
  
 
 
     
Options outstanding August 31, 2020
      2,069      $ 56.27  
Fair Value of Stock Options Granted Estimated Weighted-Average Assumptions The fair value of stock options granted was estimated using the following weighted-average assumptions.
    
FY 2020
  
Risk-free interest rate
      1.9 % 
Expected dividend yield
      0.0 % 
Expected stock price volatility
      29.4 % 
Expected option life
 
 
3.5
 
years