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Related Party Transactions - Income from its non-voting revenues interest and its non-voting profits interests in EAM (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Related Party Transactions [Abstract] |  |  |
Non-voting revenues interest in EAM | $ 7,346 | $ 6,767 | $ 5,781
Non-voting profits interest in EAM | 624 | 732 | 479
Revenues and profits interests in EAM Trust | $ 7,970 | $ 7,499 | $ 6,260

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- References No definition available. + Details
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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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Data Type: | xbrli:monetaryItemType
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