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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 | 12 Months Ended
--- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
Related Party Transaction [Line Items] |  |  |  |
Non-voting revenues interest in EAM | $ 5,781 | $ 5,684 | $ 2,187 |
Non-voting profits interest in EAM | 479 | 206 | 168 |
Revenues and profits interests in EAM Trust | 6,260 | 5,890 | 2,355 |
EAM Trust |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Non-voting revenues interest in EAM | 5,781 | 5,684 | 2,187 | [1]
Non-voting profits interest in EAM | 479 | 206 | 168 |
Revenues and profits interests in EAM Trust | $ 6,260 | $ 5,890 | $ 2,355 |
[1] | Total results of EAM's investment management operations was for the period from December 23, 2010 through April 30, 2011.

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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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