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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Apr. 30, 2014
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on Recurring Basis

As of April 30, 2014, our financial assets and liabilities that are measured at fair value on a recurring basis include the following:

 

     Fair Value Measurement at April 30, 2014 Using:  
     Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		      Significant Other
Observable Inputs
(Level 2)		      Significant
Unobservable Inputs
(Level 3)		  

Assets:

         

Restricted assets

    $ 681       $ —         $ —     
  

 

 

     

 

 

     

 

 

  

Liabilities:

         

Interest rate derivatives

    $ —         $ 2,770       $ —     
  

 

 

     

 

 

     

 

 

  

 

As of April 30, 2013, our financial assets and liabilities that are measured at fair value on a recurring basis include the following:

 

     Fair Value Measurement at April 30, 2013 Using:  
     Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		      Significant Other
Observable Inputs
(Level 2)		      Significant
Unobservable Inputs
(Level 3)		  

Assets:

         

Restricted assets

    $ 545       $ —         $ —     
  

 

 

     

 

 

     

 

 

  

Liabilities:

         

Interest rate derivatives

    $ —         $ 4,229       $ —     
  

 

 

     

 

 

     

 

 

  
Assets and Liabilities Measured at Fair Value on Non-Recurring Basis

As of April 30, 2014, our assets and liabilities that are measured at fair value on a non-recurring basis include the following:

 

     Fair Value Measurement at April 30, 2014 Using:  
     Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		      Significant Other
Observable Inputs
(Level 2)		      Significant
Unobservable Inputs
(Level 3)		  

Assets:

         

Asset group – CARES

    $ —         $ —         $ 650   
  

 

 

     

 

 

     

 

 

  

 

As of April 30, 2013, our assets and liabilities that are measured at fair value on a non-recurring basis include the following:

 

     Fair Value Measurement at April 30, 2013 Using:  
     Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		      Significant Other
Observable Inputs
(Level 2)		      Significant
Unobservable Inputs
(Level 3)		  

Assets:

         

Asset group held-for-sale – Bio Fuels

    $ —         $ —         $ 61   
  

 

 

     

 

 

     

 

 

  

Liabilities:

         

Guaranty

    $ —         $ —         $ 2,073