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Investments - Components of assets and liabilities (Details 3) - EAM Trust - USD ($)
$ in Thousands
Jul. 31, 2015
Apr. 30, 2015
Schedule of Investments [Line Items]    
EAM's total assets $ 60,167 $ 60,159
EAM's total liabilities [1] (3,050) (3,104)
EAM's total equity $ 57,117 $ 57,055
[1] At July 31, 2015 and April 30, 2015, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues and non-voting profits interests of $2,037,000 and $1,951,000, respectively.