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Property, Plant and Equipment (Tables)
12 Months Ended
Apr. 30, 2014
Property Plant And Equipment [Abstract]  
Components of Property, Plant and Equipment

Property, plant and equipment as of April 30, 2014 and 2013 consists of the following:

 

     April 30,  
     2014      2013  

Land

   $ 21,445       $ 20,722   

Landfills

     496,515         475,855   

Landfill operating lease contracts

     115,867         109,363   

Buildings and improvements

     134,787         133,330   

Machinery and equipment

     117,193         120,314   

Rolling stock

     128,155         128,038   

Containers

     85,397         80,447   
  

 

 

    

 

 

 
     1,099,359         1,068,069   

Less: accumulated depreciation and amortization

     695,935         645,567   
  

 

 

    

 

 

 
   $ 403,424       $ 422,502