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Investments - Components of EAM's investment management operations (Parentheticals) (Details 2) | 3 Months Ended | 9 Months Ended
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Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015
EAM Trust |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Non-voting profits interest ("Profits Interest") | 50.00% | 50.00% | 50.00% | 50.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Represents percentage of non-voting profits interest. + References No definition available. + Details
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- Details
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