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Investments - Components of assets and liabilities (Details 3) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Apr. 30, 2012
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Schedule of Investments [Line Items] |  |  |  |
EAM's total assets | $ 84,341 |  | $ 84,369 |
EAM's total liabilities | 51,356 |  | 52,055 |
EAM Trust |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
EAM's total assets | 59,349 |  | 57,482 |
EAM's total liabilities | (2,814) | [1] | (663) | [1]
EAM's total equity | $ 56,535 |  | $ 56,819 |
[1] | At April 30, 2013, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues and non-voting profits interests of $1,621,000.

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