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Acquisitions (Tables)
 9 Months Ended
Apr. 30, 2013
Business Combinations [Abstract]  
Schedule of preliminary purchase price allocation based on the estimated fair values of the assets acquired and liabilities assumed

 

                 
  Total cash paid, net of cash acquired   $ 31,243  
  Contingent consideration     3,690  
  Total acquisition price   $ 34,933  
  Allocation of the acquisition price:        
        Accounts receivable and prepaid expenses     848  
        Property and equipment     15,425  
        Intangible assets     9,197  
        Goodwill recorded during the period     13,456  
        Liabilities assumed     (3,993 )
  Fair value of net assets and liabilities acquired   $ 34,933