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Goodwill and Intangible Assets
3 Months Ended
Oct. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets

NOTE 5 - Goodwill and Intangible Assets

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

                       
        October 31, 2011           July 31, 2011  
  Amortized intangibles:                    
  Covenants not to compete   $ 10,896         $ 10,896  
  Supply contracts     26,743           27,238  
  Licenses and databases     1,332           1,337  
  Accumulated amortization     (27,572 )         (26,723 )
  Net intangibles   $ 11,399         $ 12,748  

Aggregate amortization expense on amortizable intangible assets was $1.1 million and $1.3 million for the three months ended October 31, 2011 and 2010, 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     (1,491 )
  Balance as of October 31, 2011   $ 197,129