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Investments - Components of assets and liabilities (Details 3) - EAM Trust - USD ($)
$ in Thousands
Apr. 30, 2015
Apr. 30, 2014
Schedule of Investments [Line Items]    
EAM's total assets $ 60,159 $ 59,965
EAM's total liabilities [1] (3,104) (3,158)
EAM's total equity $ 57,055 $ 56,807
[1] At April 30, 2015 and 2014, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues and non-voting profits interests of $1,951,000 and $1,887,000, respectively.