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Related Party Transactions (Tables)
 12 Months Ended
Apr. 30, 2014
Related Party Transactions [Abstract]  
Schedule of non voting revenues interest and non voting profits interests
 
                   
   
Fiscal Years Ended April 30,
  
  ($ in thousands)
  
2014
    
2013
    
2012
  
Non-voting revenues interest in EAM
   $ 6,767     $ 5,781     $ 5,684  
                         
Non-voting profits interest in EAM
     732       479       206  
    $ 7,499     $ 6,260     $ 5,890