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Goodwill and Intangible Assets
6 Months Ended
Jan. 31, 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):

 
                       
        January 31, 2013           July 31, 2012  
  Amortized intangibles:                    
  Covenants not to compete   $ 11,447         $ 11,087  
  Supply contracts     32,252           26,041  
  Trade name     2,524           -  
  Licenses and databases     1,566           1,316  
  Software     271           -  
  Accumulated amortization     (33,135 )         (30,459 )
  Net intangibles   $ 14,925         $ 7,985  

Aggregate amortization expense on amortizable intangible assets was $1.1 million and $2.2 million for the three and six months ended January 31, 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     294  
  Balance as of January 31, 2013   $ 210,188