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Goodwill and Intangible Assets
9 Months Ended
Apr. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets

NOTE 6 - Goodwill and Intangible Assets

The following table sets forth amortizable intangible assets by major asset class as of the dates indicated (in thousands):

 
                       
        April 30, 2012           July 31, 2011  
  Amortized intangibles:                    
  Covenants not to compete   $ 11,077         $ 10,896  
  Supply contracts     26,968           27,238  
  Licenses and databases     1,333           1,337  
  Accumulated amortization     (30,003 )         (26,723 )
  Net intangibles   $ 9,375         $ 12,748  

Aggregate amortization expense on amortizable intangible assets was $1.2 million and $1.1 million for the three months ended April 30, 2012 and 2011, respectively and $3.4 million and $3.4 million for the nine months ended April 30, 2012 and 2011, respectively.

The change in the carrying amount of goodwill is as follows (in thousands):

 
           
  Balance as of July 31, 2011   $ 198,620  
  Effect of foreign currency exchange rates     (812 )
  Balance as of April 30, 2012   $ 197,808