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Investments In Available-For-Sale Securities | 9 Months Ended
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Jan. 31, 2012
Investments In Available-For-Sale Securities [Abstract] |
Investments In Available-For-Sale Securities | 5. Investments in Available-for-Sale Securities The amortized cost and fair value of securities classified as available-for-sale (AFS) held at January 31, 2012 and April 30, 2011 are summarized below:
|  |  |  |  |  |  |  | (in 000s)
| January 31, 2012 | April 30, 2011
|  | Gross | Gross |  |  | Gross | Gross |
| Amortized | Unrealized | Unrealized | Fair | Amortized | Unrealized | Unrealized | Fair
As of | Cost | Gains | Losses (1) | Value | Cost | Gains | Losses (1) | Value
Short-term: |  |  |  |  |  |  |  |
Municipal bonds | $ 2,001 | $ 3 | $ — | $ 2,004 | $ 3,023 | $ 58 | $ — | $ 3,081
Long-term: |  |  |  |  |  |  |  |
Mortgage-backed securities | 303,519 | 3,243 | (287 ) | 306,475 | 157,970 | 401 | (194 ) | 158,177
Municipal bonds | 5,260 | 448 | — | 5,708 | 5,312 | 347 | — | 5,659
| 308,779 | 3,691 | (287 ) | 312,183 | 163,282 | 748 | (194 ) | 163,836
Total | $ 310,780 | $ 3,694 | $ (287 ) | $ 314,187 | $ 166,305 | $ 806 | $ (194 ) | $ 166,917
(1) At January 31, 2012 and April 30, 2011, we had no investments that had been in a continuous loss position for more than twelve months. We did not record any other-than-temporary impairments of AFS securities during the three or nine months ended January 31, 2012. During the three and nine months ended January 31, 2011, we recorded other-than-temporary impairments of AFS securities totaling $1.5 million and $1.9 million, respectively, as a result of an assessment that it was probable we would not collect all amounts due or an assessment that we would not be able to hold the investments until potential recovery of market value. Contractual maturities of AFS debt securities at January 31, 2012, occur at varying dates over the next 30 years, and are set forth in the table below.
|  | (in 000s)
| Cost Basis | Fair Value
Maturing in: |  |
Less than one year | $ 2,001 | $ 2,004
Two to five years | 4,204 | 4,502
Six to ten years | 1,056 | 1,206
Beyond | 303,519 | 306,475
| $ 310,780 | $ 314,187

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- Definition Tabular disclosure of available-for-sale securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 + Details
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