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GOODWILL AND INTANGIBLE ASSETS (Tables)
 9 Months Ended
Jan. 31, 2013
Schedule of Activity and Balances Related to Goodwill

The following table shows the activity and balances related to goodwill from April 30, 2012 through January 31, 2013:

 

     April 30, 2012      Acquisitions      January 31, 2013  

Eastern region

    $ 58       $ 13,339       $ 13,397   

Western region

      89,458         1,236       $ 90,694   

Recycling

      12,190         —         $ 12,190   
  

 

 

     

 

 

     

 

 

  

Total

    $ 101,706       $ 14,575       $ 116,281   
  

 

 

     

 

 

     

 

 

  
Components of Intangible Assets

Intangible assets as of January 31, 2013 and April 30, 2012 consist of the following:

 

     Covenants
Not to
Compete		     Client Lists     Total  

Balance, January 31, 2013

       

Intangible assets

    $ 17,022      $ 11,432      $ 28,454   

Less accumulated amortization

      (14,661 )      (1,814 )      (16,475 ) 
  

 

 

    

 

 

    

 

 

  
   $ 2,361      $ 9,618      $ 11,979   
  

 

 

    

 

 

    

 

 

  

Balance, April 30, 2012

       

Intangible assets

    $ 15,601      $ 3,093      $ 18,694   

Less accumulated amortization

      (14,324 )      (1,400 )      (15,724 ) 
  

 

 

    

 

 

    

 

 

  
   $ 1,277      $ 1,693      $ 2,970   
  

 

 

    

 

 

    

 

 

  
Estimated of Amortization Expenses

Intangible amortization expense for the three and nine months ended January 31, 2013 and 2012 was $353, $156, $751 and $460, respectively. The intangible amortization expense estimated for the five fiscal years following fiscal year 2012 and thereafter is as follows:

 

2013

  

2014

  

2015

  

2016

  

2017

  

Thereafter
$    1,829   $    1,660   $    1,610   $    1,429   $    1,325   $    4,877