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Acquisitions (Tables)
 6 Months Ended
Jan. 31, 2014
Acquisitions [Abstract]  
Schedule of preliminary purchase price allocation based on the estimated fair values of the assets acquired and liabilities assumed

 

                                                               
          Three Months Ended January 31,           Six Months Ended January 31,  
            2014           2013           2014           2013  
Total cash paid, net of cash acquired         $ 14,228         $ 31,243         $ 14,228         $ 31,243  
Contingent consideration           533           3,690           533           3,690  
Total acquisition price         $ 14,761         $ 34,933         $ 14,761         $ 34,933