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v2.3.0.11

Investments (Narrative) (Details) (USD $) | 12 Months Ended
--- | ---
Apr. 30, 2011 | Apr. 30, 2010 | Apr. 30, 2009
Investments |  |  |
Proceeds from the sales of AFS securities | $ 0 | $ 2,100,000 | $ 8,300,000
Gross realized gains on sales of AFS securities |  | 0 | 700,000
Gross realized losses on sales of AFS securities |  | 0 | 1,300,000
Other-than-temporary impairments of AFS securities | 1,900,000 | 1,600,000 | 1,500,000
Held-to-maturity investment | $ 3,300,000 | $ 6,000,000 |

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