XML 43 R21.htm IDEA: XBRL DOCUMENT v2.4.1.9
Equity Compensation Plans (Tables)
9 Months Ended
Feb. 28, 2015
Stock Option Activity

A summary of stock option activity during the nine months ended February 28, 2015 follows:

 

     Shares      Weighted-
Average
Exercise Price
 

Options outstanding at June 1, 2014

     1,869,000       $ 25.69   

Granted

     530,000         39.79   

Exercised

     (295,000      17.04   

Forfeited

     (28,000      33.74   
  

 

 

    

Options outstanding at February 28, 2015

  2,076,000      30.41   

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.

 

     FY2015   FY2014

Risk-free interest rate

   1.2%   0.8%

Expected dividend yield

   0%   0%

Expected stock price volatility

   36.2%   33.1%

Expected option life

   4.0 years   4.0 years