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Equity Compensation Plans (Tables)
9 Months Ended
Feb. 28, 2017
Stock Option Activity

A summary of stock option activity during the nine months ended February 28, 2017 follows:

 

     Shares      Weighted-
Average
Exercise Price
 

Options outstanding June 1, 2016

     2,081,000      $ 36.71  

Granted

     618,000        54.19  

Exercised

     (542,000      29.04  

Forfeited

     (49,000      42.72  
  

 

 

    

Options outstanding February 28, 2017

     2,108,000        43.66  
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.

 

     FY2017     FY2016  

Risk-free interest rate

     1.2     1.2

Expected dividend yield

     0.0     0.0

Expected stock price volatility

     35.2     33.3

Expected option life

     4.0 years       4.0 years