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Equity Compensation Plans (Tables)
 6 Months Ended
Nov. 30, 2020
Stock Option Activity A summary of stock option activity during the
six
 months ended November 30, 2020 follows:
           
Weighted-
  
           
Average
  
(Options in thousands)
   
Shares
     
Exercise Price
  
Options outstanding June 1, 2020
      2,162      $ 55.96  
Granted
      202        68.47  
Exercised
      (294 )       42.04  
Forfeited
      (160 )       57.26  
    
 
 
           
Options outstanding November 30, 2020
      1,910      $ 59.29  
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 2021
Risk-free interest rate
    0.2%
Expected dividend yield
    0.0%
Expected stock price volatility
    31.3%
Expected option life
    3.25 years