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Variable Interest Entity (Tables)
12 Months Ended
Apr. 30, 2013
Variable Interest Entity [Abstract]  
Schedule of total assets, the maximum exposure to loss, value of the assets and liabilities in EAM
 
         
Value Line
6155799223l30i71g61jig5436kljg43
 
($ in thousands)
 
VIE Assets
   
Investment in
EAM Trust 
(1)
   
Liabilities
   
Maximum
Exposure to
Loss
 
As of April 30, 2013
  $ 59,349     $ 57,511     $ -     $ 57,511  
As of April 30, 2012
  $ 57,482     $ 56,331     $ -     $ 56,331  
 
(1) Reported within Long Term Assets on Consolidated Balance Sheets.