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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
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.