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Stock-Based Compensation (Tables)
 12 Months Ended
May 31, 2014
Stock-Based Compensation  
Assumptions used in the Black-Scholes option pricing model to estimate the fair value of each stock option grant
 
   Stock Options Granted
In Fiscal Year		  
 
   2014   2013   2012  

Risk-free interest rate

     1.4 %   0.6 %   1.5 %

Expected volatility of common stock

     49.1 %   51.4 %   46.1 %

Dividend yield

     1.2 %   2.3 %   1.1 %

Expected option term in years

     5.2     5.4     5.7  
Summary of stock option activity

A summary of stock option activity for the three years ended May 31, 2014 consisted of the following (shares in thousands):

 
   2014   2013   2012  
 
   Shares   Weighted
Average
Exercise Price		   Shares   Weighted
Average
Exercise Price		   Shares   Weighted
Average
Exercise Price		  

Outstanding at beginning of year

     2,300   $ 16.22     1,703   $ 17.96     1,994   $ 18.56  

Granted

     1,033   $ 25.43     972   $ 12.95     169   $ 28.45  

Exercised

     (473 ) $ 16.20     (124 ) $ 13.72     (339 ) $ 19.95  

Cancelled

     (107 ) $ 18.48     (251 ) $ 15.82     (121 ) $ 19.73  
                                 
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Outstanding at end of year

     2,753   $ 19.59     2,300   $ 16.22     1,703   $ 17.96  
                                 
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Options exercisable at end of year

     1,019   $ 17.88     1,089   $ 17.73     880   $ 17.10  
                                 
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Schedule of additional information regarding stock options outstanding

The following table provides additional information regarding stock options outstanding as of May 31, 2014 (shares in thousands):

 
   Options Outstanding   Options Exercisable  
Option
Exercise
Price Range		   Number
Outstanding as
of 5/31/14		   Weighted-Average
Remaining Contractual
Life in Years		   Weighted-
Average Exercise
Price		   Number
Exercisable as
of 5/31/14		   Weighted-
Average Exercise
Price		  

$  9.00 - $15.00

     800     8.0   $ 12.86     125   $ 12.63  

$15.01 - $20.00

     748     5.6   $ 16.17     730   $ 16.16  

$20.01 - $34.50

     1,205     8.5   $ 26.17     164   $ 29.49  
                             
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     2,753     7.6   $ 19.59     1,019   $ 17.88  
                             
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Schedule of restricted share activity

Restricted share activity during the fiscal year ended May 31, 2014 was as follows (shares in thousands):

 
   Number of
Shares		   Weighted Average
Fair Value
on Grant Date		  

Nonvested at May 31, 2013

     1,253   $ 22.91  

Granted

     167   $ 24.15  

Vested

     (400 ) $ 24.36  

Forfeited

     (30 ) $ 27.65  
             
​ ​ ​ ​ ​ ​ ​ ​

Nonvested at May 31, 2014

     990   $ 22.49  
             
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