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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, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 | Jan. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |  |  |
Non-voting revenues interest in EAM |  |  | $ 4,280 | $ 4,251
Non-voting profits interest in EAM |  |  | 347 | 120
Revenues and profits interests in EAM Trust | 1,625 | 1,456 | 4,627 | 4,371
EAM Trust |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Non-voting revenues interest in EAM | 1,472 | 1,430 | 4,280 | 4,251
Non-voting profits interest in EAM | 153 | 26 | 347 | 120
Revenues and profits interests in EAM Trust | $ 1,625 | $ 1,456 | $ 4,627 | $ 4,371

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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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