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Entity Wide Disclosures (Tables)
3 Months Ended
Aug. 31, 2012
Entity Wide Disclosures [Abstract]  
Segment reporting of revenues and total assets
                 
    Three Months Ended
August 31, 2012
    Three Months Ended
August 31, 2011
 
    (unaudited)        

Revenues:

               

United States

  $             113,054     $             92,316  

Canada

    35,086       33,875  

Europe

    6,700       7,550  

Other foreign countries

    6,652       7,352  
   

 

 

   

 

 

 

Total

  $ 161,492     $ 141,093  
   

 

 

   

 

 

 
     
    August 31, 2012     May 31, 2012  
    (unaudited)        

Total assets:

               

United States

  $             289,384     $             296,240  

Canada

    66,512       60,334  

Europe

    30,181       30,352  

Other foreign countries

    21,240       16,862  
   

 

 

   

 

 

 

Total

  $ 407,317     $ 403,788