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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jan. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of aggregate amortization expense on intangible assets

 

                     
      January 31, 2014           July 31, 2013  
Amortized intangibles:                    
Covenants not to compete   $ 17,525         $ 12,515  
Supply contracts     28,364           26,322  
Customer relationships     7,478           7,389  
Trade name     3,066           2,998  
Licenses and databases     2,094           3,306  
Accumulated amortization     (38,818 )         (34,824 )
Net intangibles   $ 19,709         $ 17,706  
Schedule of change in carrying amount of goodwill
 
       
Balance as of July 31, 2013   $ 267,463
Goodwill recorded during the period, see Note 13. Acquisitions     18,072
Effect of foreign currency exchange rates     5,692
Balance as of January 31, 2014   $ 291,227