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Related Party Transactions (Tables) | 12 Months Ended
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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 |

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