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Net Income Per Share (Tables)
 12 Months Ended
Jun. 30, 2011
Net Income Per Share  
Schedule of Net Income Per Share
     Year ended June 30,  
     2011      2010      2009  

Basic earnings per share

         

Net income

    $ 123,203       $ 89,212       $ 56,938   
  

 

 

     

 

 

     

 

 

  

Basic earnings per share

    $ 2.16       $ 1.59       $ 1.09   
  

 

 

     

 

 

     

 

 

  

Diluted earnings per share

         

Net income

    $ 123,203       $ 89,212       $ 56,938   
  

 

 

     

 

 

     

 

 

  

Diluted earnings per share

    $ 2.11       $ 1.55       $ 1.07   
  

 

 

     

 

 

     

 

 

  

Weighted average number of shares outstanding

         

Basic

      57,077         56,280         52,030   

Effect of dilutive securities

      1,183         1,105         1,241   
  

 

 

     

 

 

     

 

 

  

Diluted

      58,260         57,385         53,271   
  

 

 

     

 

 

     

 

 

  

Excluded as anti-dilutive*

      48         577         87   
  

 

 

     

 

 

     

 

 

  

* Represents options to purchase Common Shares excluded from the calculation of diluted net income per share because the exercise price of the stock options was greater than or equal to the average price of the Common Shares during the period.