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Investments - Components of assets and liabilities (Details 3) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Apr. 30, 2012
Schedule of Investments [Line Items]    
EAM's total assets $ 84,341 $ 84,369
EAM's total liabilities 51,356 52,055
EAM Trust
    
Schedule of Investments [Line Items]    
EAM's total assets 59,349 57,482
EAM's total liabilities (2,814) [1] (663) [1]
EAM's total equity $ 56,535 $ 56,819
[1] At April 30, 2013, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues and non-voting profits interests of $1,621,000.