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Related Party Transactions (Tables) | 12 Months Ended
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Apr. 30, 2013
Related Party Transactions [Abstract] |
Schedule of non voting revenues interest and non voting profits interests |
|  | Fiscal Years Ended April 30, |
($ in thousands) |  | 2013 6155799223l30i71g61jig5436kljg43 |  |  | 2012 |  |  | 2011 |
Non-voting revenues interest in EAM |  | $ | 5,781 |  |  | $ | 5,684 |  |  | $ | 2,187 |
Non-voting profits interest in EAM |  |  | 479 |  |  |  | 206 |  |  |  | 168 |
|  | $ | 6,260 |  |  | $ | 5,890 |  |  | $ | 2,355 |

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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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