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Related Party Transactions (Tables)
 12 Months Ended
Apr. 30, 2015
Related Party Transactions [Abstract]  
Schedule of non voting revenues interest and non voting profits interests
    Fiscal Years Ended April 30,  
 ($ in thousands)   2015     2014     2013  
Non-voting revenues interest in EAM   $ 7,346     $ 6,767     $ 5,781  
Non-voting profits interest in EAM     624       732       479  
    $ 7,970     $ 7,499     $ 6,260