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Investments | 12 Months Ended
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Apr. 30, 2014
Investments, Debt and Equity Securities [Abstract] |
Investments | The amortized cost and fair value of securities classified as AFS are summarized below:
(in 000s) |
As of April 30, |  | 2014 |  | 2013
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Mortgage-backed securities |  | $ | 420,697 |  |  | $ | 2,798 |  |  | $ | — |  |  | $ | 423,495 |  |  | $ | 476,450 |  |  | $ | 6,592 |  |  | $ | (664 | ) |  | $ | 482,378 |
Municipal bonds |  | 4,120 |  |  | 209 |  |  | — |  |  | 4,329 |  |  | 4,178 |  |  | 320 |  |  | — |  |  | 4,498 |
|  | $ | 424,817 |  |  | $ | 3,007 |  |  | $ | — |  |  | $ | 427,824 |  |  | $ | 480,628 |  |  | $ | 6,912 |  |  | $ | (664 | ) |  | $ | 486,876 |
During fiscal year 2014, we recorded other-than-temporary impairments of AFS securities totaling $12.4 million. We did not record any other-than-temporary impairments of AFS securities during fiscal years 2013 or 2012. Substantially all AFS debt securities held as of April 30, 2014 mature after five years.

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