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Related Party Transactions - Income from non-voting revenues interest and non-voting profits interests in EAM (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013
Related Party Transactions [Abstract] |  |  |  |
Non-voting revenues interest in EAM | $ 1,803 | $ 1,663 | $ 3,636 | $ 3,261
Non-voting profits interest in EAM | 146 | 191 | 335 | 362
Revenues and profits interests in EAM Trust | $ 1,949 | $ 1,854 | $ 3,971 | $ 3,623

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- 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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