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Marketable Securities (Tables) | 12 Months Ended
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Apr. 30, 2015
Summary of Marketable Securities | As of April 30, 2015, marketable securities consisted of the following:
|  | Trading (1)(2) |  |  | Available-for- Sale (2) |  |  | Total |
|  | (in thousands) |
Mutual funds |  | $ | 131,399 |  |  | $ | — |  |  | $ | 131,399 |
Corporate bonds |  |  | — |  |  |  | 13,177 |  |  |  | 13,177 |
Total |  |  | 131,399 |  |  |  | 13,177 |  |  |  | 144,576 |
Less: current portion of marketable securities |  |  | (12,580 | ) |  |  | (13,177 | ) |  |  | (25,757 | )
Non-current marketable securities |  | $ | 118,819 |  |  | $ | — |  |  | $ | 118,819 |
As of April 30, 2014, marketable securities consisted of the following:
|  | Trading (1)(2) |  |  | Available-for- Sale (2) |  |  | Total |
|  | (in thousands) |
Mutual funds |  | $ | 116,207 |  |  | $ | — |  |  | $ | 116,207 |
Corporate bonds |  |  | — |  |  |  | 18,352 |  |  |  | 18,352 |
Total |  |  | 116,207 |  |  |  | 18,352 |  |  |  | 134,559 |
Less: current portion of marketable securities |  |  | (4,510 | ) |  |  | (5,056 | ) |  |  | (9,566 | )
Non-current marketable securities |  | $ | 111,697 |  |  | $ | 13,296 |  |  | $ | 124,993 |
(1) | These investments are held in trust for settlement of the Company’s vested and unvested obligations of $129.1 million and $117.6 million as of April 30, 2015 and 2014, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). During fiscal 2015, 2014 and 2013, the fair value of the investments increased; therefore, the Company recognized income of $8.8 million, $9.5 million, and $7.6 million, respectively, which was recorded in other income, net.
(2) | The Company’s financial assets measured at fair value on a recurring basis include trading securities classified as Level 1 and available-for-sale securities classified as Level 2. As of April 30, 2015 and 2014, the Company had no investments classified as Level 3.
Amortized Cost and Fair Values of Marketable Securities Classified as Available-For-Sale Investments | The amortized cost and fair values of marketable securities classified as available-for-sale investments were as follows:
|  | April 30, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses (1) |  |  | Estimated Fair Value |
|  | (in thousands) |
Corporate bonds |  | $ | 13,167 |  |  | $ | 11 |  |  | $ | (1 | ) |  | $ | 13,177 |
|  | April 30, 2014 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses (1) |  |  | Estimated Fair Value |
|  | (in thousands) |
Corporate bonds |  | $ | 18,325 |  |  | $ | 31 |  |  | $ | (4 | ) |  | $ | 18,352 |
(1) | There are no marketable securities that have been in a continuous unrealized loss position for 12 months or more.

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 3: 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=27724398&loc=d3e27198-111563 Reference 4: 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 5: 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=27724398&loc=d3e27161-111563 Reference 6: 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=27724398&loc=d3e27357-111563 Reference 7: 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=27724398&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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