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Investments - Components of assets and liabilities (Details 3) (EAM Trust, USD $) In Thousands, unless otherwise specified | Jan. 31, 2014 | Apr. 30, 2013
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EAM Trust |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
EAM's total assets | $ 59,730 |  | $ 59,349 |
EAM's total liabilities | (2,987) | [1] | (2,814) | [1]
EAM's total equity | $ 56,743 |  | $ 56,535 |
[1] | At January 31, 2014 and April 30, 2013, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues and non-voting profits interests of $1,953,000 and $1,621,000, respectively.

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