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Commitments and Contingencies (Tables)
 6 Months Ended
Oct. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Environmental Liability Associated with Postdam

The changes to the environmental remediation liability associated with the Potsdam environmental remediation liability for the six months ended October 31, 2014 and 2013 are as follows:

 

     Six Months Ended October 31,  
     2014     2013  

Beginning balance

    $ 5,320      $ 5,297   

Obligations incurred

      —          31   

Accretion expense

      69        69   

Payments

      (270 )      —     
  

 

 

    

 

 

  

Ending balance

    $ 5,119      $ 5,397