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Equity Compensation Plans (Tables)
9 Months Ended
Feb. 28, 2019
Stock Option Activity A summary of stock option activity during the nine months ended February 28, 2019 follows:
 
 
 
 
 
 
Weighted-
 
 
 
 
 
 
Average
 
 
 
Shares
 
 
Exercise Price
 
Options outstanding June 1, 2018
 
 
2,497,124
 
 
$
42.63
 
Granted
 
 
526,750
 
 
 
62.92
 
Exercised
 
 
(418,598
)
 
 
30.76
 
Forfeited
 
 
(105,835
)
 
 
46.50
 
Options outstanding February 28, 2019
 
 
2,499,441
 
 
 
48.78
 
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
 
 
FY 2018
 
Risk-free interest rate
 
 
2.6
%
 
 
1.6
%
Expected dividend yield
 
 
0.0
%
 
 
0.0
%
Expected stock price volatility
 
 
27.0
%
 
 
27.2
%
Expected option life
 
 
3.5
 years
 
 
 
4.0
 years