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Related Party Transactions (Tables)
 12 Months Ended
Apr. 30, 2013
Related Party Transactions [Abstract]  
Schedule of non voting revenues interest and non voting profits interests
    Fiscal Years Ended April 30,  
 ($ in thousands)
  
2013
6155799223l30i71g61jig5436kljg43
    
2012
    
2011
  
Non-voting revenues interest in EAM
   $ 5,781     $ 5,684     $ 2,187  
                         
Non-voting profits interest in EAM
     479       206       168  
    $ 6,260     $ 5,890     $ 2,355