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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Oct. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of aggregate amortization expense on intangible assets
 
  
October 31, 2013
  
July 31, 2013
 
Amortized intangibles:
      
Covenants not to compete
 $12,526  $12,515 
Supply contracts
  27,696   26,322 
Customer relationships
  7,513   7,389 
Trade name
  3,078   2,998 
Licenses and databases
  2,092   3,306 
Accumulated amortization
  (36,998)  (34,824)
Net intangibles
 $15,907  $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
     9,600  
Effect of foreign currency exchange rates
     4,384  
Balance as of October 31, 2013
   $ 281,447