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Related Party Transactions (Tables) | 9 Months Ended
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Jan. 31, 2016
Related Party Transactions [Abstract] |
Schedule of non voting revenues interest and non voting profits interests |
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
($ in thousands) |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Non-voting revenues interest in EAM |  | $ | 1,825 |  |  | $ | 1,862 |  |  | $ | 5,546 |  |  | $ | 5,498 |
Non-voting profits interest in EAM |  |  | 94 |  |  |  | 162 |  |  |  | 355 |  |  |  | 497 |
|  | $ | 1,919 |  |  | $ | 2,024 |  |  | $ | 5,901 |  |  | $ | 5,995 |

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- Definition Schedule of non voting revenues interest and non voting profits interests. + References No definition available. + Details
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