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Financial Instruments (Tables) | 3 Months Ended
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Jul. 31, 2016
Cash, Trading Securities and Foreign Currency Forward Contracts' Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value Recorded as Cash and Cash Equivalents, Current Portion of Current Marketable Securities, Non-Current Marketable Securities, or Other Accrued Liabilities | The following tables show the Company’s cash, trading securities and foreign currency forward contracts’ cost, gross unrealized gains, gross unrealized losses and fair value by significant category recorded as cash and cash equivalents, current portion of current marketable securities, non-current marketable securities, or other accrued liabilities as of July 31, 2016 and April 30, 2016:
|  | July 31, 2016 |
|  | Fair Value Measurement |  |  | Balance Sheet Classification |
|  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities, Current |  |  | Marketable Securities, Non-current |  |  | Other Accrued Liabilities |
|  | (in thousands) |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 119,660 |  |  | $ | — |  |  | $ | — |  |  | $ | 119,660 |  |  | $ | 119,660 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Money market funds |  |  | 124,413 |  |  |  | — |  |  |  | — |  |  |  | 124,413 |  |  |  | 124,413 |  |  |  | — |  |  |  | — |  |  |  | — |
Mutual funds (1) |  |  | 134,447 |  |  |  | 3,477 |  |  |  | (947 | ) |  |  | 136,977 |  |  |  | — |  |  |  | 3,475 |  |  |  | 133,502 |  |  |  | — |
Total |  | $ | 378,520 |  |  | $ | 3,477 |  |  | $ | (947 | ) |  | $ | 381,050 |  |  | $ | 244,073 |  |  | $ | 3,475 |  |  | $ | 133,502 |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | $ | — |  |  | $ | 419 |  |  | $ | (966 | ) |  | $ | (547 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (547 | )
|  | April 30, 2016 |
|  | Fair Value Measurement |  |  | Balance Sheet Classification |
|  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities, Current |  |  | Marketable Securities, Non-current |  |  | Other Accrued Liabilities |
|  | (in thousands) |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 155,702 |  |  | $ | — |  |  | $ | — |  |  | $ | 155,702 |  |  | $ | 155,702 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Money market funds |  |  | 117,550 |  |  |  | — |  |  |  | — |  |  |  | 117,550 |  |  |  | 117,550 |  |  |  | — |  |  |  | — |  |  |  | — |
Mutual funds (1) |  |  | 142,588 |  |  |  | 1,395 |  |  |  | (2,553 | ) |  |  | 141,430 |  |  |  | — |  |  |  | 11,338 |  |  |  | 130,092 |  |  |  | — |
Total |  | $ | 415,840 |  |  | $ | 1,395 |  |  | $ | (2,553 | ) |  | $ | 414,682 |  |  | $ | 273,252 |  |  | $ | 11,338 |  |  | $ | 130,092 |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | $ | — |  |  | $ | 324 |  |  | $ | (1,041 | ) |  | $ | (717 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (717 | )
(1) | These investments are held in trust for settlement of the Company’s vested and unvested obligations of $133.9 million and $138.8 million as of July 31, 2016 and April 30, 2016, respectively, under the ECAP (see Note 7 — Deferred Compensation and Retirement Plans). During the three months ended July 31, 2016 and 2015, the fair value of the investments increased; therefore, the Company recognized income of $3.9 million and $0.7 million, respectively, which was recorded in other income (loss), net.
Cash, Trading Securities and Foreign Currency Forward Contracts' Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value Recorded as Cash and Cash Equivalents, Current Portion of Current Marketable Securities, Non-Current Marketable Securities, or Other Accrued Liabilities | The following tables show the Company’s cash, trading securities and foreign currency forward contracts’ cost, gross unrealized gains, gross unrealized losses and fair value by significant category recorded as cash and cash equivalents, current portion of current marketable securities, non-current marketable securities, or other accrued liabilities as of July 31, 2016 and April 30, 2016:
|  | July 31, 2016 |
|  | Fair Value Measurement |  |  | Balance Sheet Classification |
|  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities, Current |  |  | Marketable Securities, Non-current |  |  | Other Accrued Liabilities |
|  | (in thousands) |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 119,660 |  |  | $ | — |  |  | $ | — |  |  | $ | 119,660 |  |  | $ | 119,660 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Money market funds |  |  | 124,413 |  |  |  | — |  |  |  | — |  |  |  | 124,413 |  |  |  | 124,413 |  |  |  | — |  |  |  | — |  |  |  | — |
Mutual funds (1) |  |  | 134,447 |  |  |  | 3,477 |  |  |  | (947 | ) |  |  | 136,977 |  |  |  | — |  |  |  | 3,475 |  |  |  | 133,502 |  |  |  | — |
Total |  | $ | 378,520 |  |  | $ | 3,477 |  |  | $ | (947 | ) |  | $ | 381,050 |  |  | $ | 244,073 |  |  | $ | 3,475 |  |  | $ | 133,502 |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | $ | — |  |  | $ | 419 |  |  | $ | (966 | ) |  | $ | (547 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (547 | )
|  | April 30, 2016 |
|  | Fair Value Measurement |  |  | Balance Sheet Classification |
|  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities, Current |  |  | Marketable Securities, Non-current |  |  | Other Accrued Liabilities |
|  | (in thousands) |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 155,702 |  |  | $ | — |  |  | $ | — |  |  | $ | 155,702 |  |  | $ | 155,702 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Money market funds |  |  | 117,550 |  |  |  | — |  |  |  | — |  |  |  | 117,550 |  |  |  | 117,550 |  |  |  | — |  |  |  | — |  |  |  | — |
Mutual funds (1) |  |  | 142,588 |  |  |  | 1,395 |  |  |  | (2,553 | ) |  |  | 141,430 |  |  |  | — |  |  |  | 11,338 |  |  |  | 130,092 |  |  |  | — |
Total |  | $ | 415,840 |  |  | $ | 1,395 |  |  | $ | (2,553 | ) |  | $ | 414,682 |  |  | $ | 273,252 |  |  | $ | 11,338 |  |  | $ | 130,092 |  |  | $ | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | $ | — |  |  | $ | 324 |  |  | $ | (1,041 | ) |  | $ | (717 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (717 | )
(1) | These investments are held in trust for settlement of the Company’s vested and unvested obligations of $133.9 million and $138.8 million as of July 31, 2016 and April 30, 2016, respectively, under the ECAP (see Note 7 — Deferred Compensation and Retirement Plans). During the three months ended July 31, 2016 and 2015, the fair value of the investments increased; therefore, the Company recognized income of $3.9 million and $0.7 million, respectively, which was recorded in other income (loss), net.
Fair Value of Derivatives Not Designated as Hedge Instruments | The fair value of derivatives not designated as hedge instruments are as follows:
|  | July 31, 2016 |  |  | April 30, 2016 |
|  | (in thousands) |
Derivative assets: |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | $ | 419 |  |  | $ | 324 |
Derivative liabilities: |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | $ | 966 |  |  | $ | 1,041 |

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