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Investments - Components of assets and liabilities (Details 3) (USD $) In Thousands, unless otherwise specified | Oct. 31, 2012 | Apr. 30, 2012 | Oct. 31, 2012 EAM Trust | Oct. 31, 2011 EAM Trust
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Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
EAM's total assets | $ 81,987 | $ 84,369 | $ 58,999 |  | $ 57,493 |
EAM's total liabilities (1) | 49,297 | 52,055 | (2,580) | [1] | (796) | [1]
EAM's total equity |  |  | $ 56,419 |  | $ 56,697 |
[1] | At October 31, 2012, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues and non-voting profits interests of $1,513,000.

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