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Equity Compensation Plans (Tables)
 9 Months Ended
Feb. 29, 2020
Stock Option Activity A summary of stock option activity during the nine months ended February 29, 2020 follows:
                 
 
 
  
Weighted-
 
 
 
  
Average
 
(Options in thousands)
 
Shares
 
  
Exercise Price
 
Options outstanding June 1, 2019
   
2,385
    $
49.37
 
Granted
   
561
     
63.91
 
Exercised
   
(686
)     
40.07
 
Forfeited
   
(56
)     
56.67
 
                 
Options outstanding February 29, 2020
   
2,204
    $
55.77
 
 
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 2020
 
Risk-free interest rate
   
1.9%
 
Expected dividend yield
   
0.0%
 
Expected stock price volatility
   
29.4%
 
Expected option life
   
3.5 years