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Related Party Transactions (Tables) | 6 Months Ended
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Oct. 31, 2014
Related Party Transactions [Abstract] |
Schedule of non voting revenues interest and non voting profits interests |
|  | Three Months Ended October 31, |  |  | Six Months Ended October 31, |
($ in thousands) |  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Non-voting revenues interest in EAM |  | $ | 1,803 |  |  | $ | 1,663 |  |  | $ | 3,636 |  |  | $ | 3,261 |
Non-voting profits interest in EAM |  |  | 146 |  |  |  | 191 |  |  |  | 335 |  |  |  | 362 |
|  | $ | 1,949 |  |  | $ | 1,854 |  |  | $ | 3,971 |  |  | $ | 3,623 |

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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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