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Goodwill and Intangible Assets
9 Months Ended
Apr. 30, 2013
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):

 
                       
        April 30, 2013           July 31, 2012  
  Amortized intangibles:                    
  Covenants not to compete   $ 11,430         $ 11,087  
  Supply contracts     31,650           26,041  
  Trade name     2,440           -  
  Licenses and databases     1,552           1,316  
  Software     262           -  
  Accumulated amortization     (34,234 )         (30,459 )
  Net intangibles   $ 13,100         $ 7,985  

Aggregate amortization expense on amortizable intangible assets was $1.0 million and $1.2 million for the three months ended April 30, 2013 and 2012, respectively, and $3.2 million and $3.4 million for the nine months ended April 30, 2013 and 2012, respectively.

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

 
           
  Balance as of July 31, 2012   $ 196,438  
  Goodwill recorded during the period     13,456  
  Effect of foreign currency exchange rates     (1,314 )
  Balance as of April 30, 2013   $ 208,580