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Goodwill and Intangible Assets (Tables)
6 Months Ended
Jan. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortizable intangible assets by major asset class
 
                       
        January 31, 2012           July 31, 2011  
  Amortized intangibles:                    
  Covenants not to compete   $ 11,077         $ 10,896  
  Supply contracts     26,020           27,238  
  Licenses and databases     1,323           1,337  
  Accumulated amortization     (28,236 )         (26,723 )
  Net intangibles   $ 10,184         $ 12,748  
Change in carrying amount of goodwill
 
           
  Balance as of July 31, 2011   $ 198,620  
  Effect of foreign currency exchange rates     (3,666 )
  Balance as of January 31, 2012   $ 194,954