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Final Capping, Closure and Post-Closure Costs (Tables)
 8 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Changes to Accrued Capping, Closure and Post-Closure Liabilities

The changes to accrued final capping, closure and post-closure liabilities for transition period 2014, fiscal year 2014, and fiscal year 2013 are as follows:

 

     Eight Months Ended
December 31, 2014		      Fiscal Year Ended April 30,  
                2014                      2013          

Beginning balance

    $ 44,654       $ 43,170       $ 39,629   

Obligations incurred

      2,169         3,621         3,188   

Revisions in estimates (1)

      (3,378 )       (3,728 )       (694 ) 

Accretion expense

      2,275         3,967         3,538   

Obligations settled (2)

      (5,891 )       (2,376 )       (2,491 ) 
  

 

 

     

 

 

     

 

 

  

Ending balance

 $ 39,829    $ 44,654    $ 43,170   
  

 

 

     

 

 

     

 

 

  

 

(1) The revisions in estimates for final capping, closure and post-closure for transition period 2014, fiscal year 2014 and fiscal year 2013 consist of changes in cost estimates and the timing of final capping and closure events, as well as changes to expansion airspace and tonnage placement assumptions.
(2) Includes amounts that are being processed through accounts payable as a part of our disbursement cycle.