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Related Party Transactions - Income from non-voting revenues interest and non-voting profits interests in EAM (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015
Related Party Transactions [Abstract] |  |  |  |
Non-voting revenues interest in EAM | $ 1,825 | $ 1,862 | $ 5,546 | $ 5,498
Non-voting profits interest in EAM | 94 | 162 | 355 | 497
Non-voting revenues and non-voting profits interests in EAM Trust | $ 1,919 | $ 2,024 | $ 5,901 | $ 5,995

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- Definition Represents the income received against non voting profits in unconsolidated entity. + References No definition available. + Details
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- Definition Represents the income received against non voting revenues in unconsolidated entity. + References No definition available. + Details
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- Definition Represents the revenues and profits distribution from unconsolidated entity. + References No definition available. + Details
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