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Receivables (Tables)
 6 Months Ended
Nov. 30, 2013
Summary of Accounts Receivable

A summary of accounts receivable as of November 30, 2013 and May 31, 2013 is as follows (in thousands):

 

     November 30, 2013     May 31, 2013  
     (unaudited)        

Trade accounts receivable

    $ 164,751      $ 152,030   

Unbilled revenues

      24,976        25,516   

Allowance for doubtful accounts

      (5,141 )      (5,438 ) 
  

 

 

    

 

 

  

Total

    $ 184,586      $ 172,108