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Investments - Components of assets and liabilities (Details 3) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2013 | Apr. 30, 2012
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Schedule of Equity Method Investments [Line Items] |  |  |  |
Total assets | $ 83,334 |  | $ 84,369 |
Total liabilities | 50,477 |  | 52,055 |
EAM Trust |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total assets | 59,141 |  | 57,482 |
Total liabilities | (2,664) | [1] | (663) | [1]
Total equity | $ 56,477 |  | $ 56,819 |
[1] | At January 31, 2013, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues and non-voting profits interests of $1,588,000.

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