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Investments - Components of assets and liabilities (Details 3) - EAM Trust - USD ($) $ in Thousands | Jan. 31, 2016 | Apr. 30, 2015
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Schedule of Investments [Line Items] |  |  |
EAM's total assets |  | $ 60,259 | $ 60,159
EAM's total liabilities | [1] | (3,039) | (3,104)
EAM's total equity |  | $ 57,220 | $ 57,055
[1] | At January 31, 2016 and April 30, 2015, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues, interest and the 90% distributable share of its non-voting profits interest of $1,901,000 and $1,951,000, respectively.

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