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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 (Detail) - USD ($) $ in Thousands | Jan. 31, 2017 | Apr. 30, 2016 | Jan. 31, 2016 | Apr. 30, 2015
--- | --- | --- | --- | ---
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 351,305 | $ 273,252 | $ 207,342 | $ 380,838
Marketable Securities, Current |  | 4,139 | 11,338 |  |
Marketable securities, non-current |  | 111,289 | 130,092 |  |
Other Accrued Liabilities |  | (150,009) | (145,023) |  |
Fair Value, Inputs, Level 1 |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost |  | 463,837 | 415,840 |  |
Unrealized Gains |  | 4,479 | 1,395 |  |
Unrealized Losses |  | (1,583) | (2,553) |  |
Fair Value |  | 466,733 | 414,682 |  |
Cash and cash equivalents |  | 351,305 | 273,252 |  |
Marketable Securities, Current |  | 4,139 | 11,338 |  |
Marketable securities, non-current |  | 111,289 | 130,092 |  |
Fair Value, Inputs, Level 1 | Cash |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 154,462 | 155,702 |  |
Cost |  | 154,462 | 155,702 |  |
Fair Value |  | 154,462 | 155,702 |  |
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 196,843 | 117,550 |  |
Fair Value |  | 196,843 | 117,550 |  |
Cost |  | 196,843 | 117,550 |  |
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized Gains | [1] | 4,479 | 1,395 |  |
Unrealized Losses | [1] | (1,583) | (2,553) |  |
Marketable Securities, Current | [1] | 4,139 | 11,338 |  |
Marketable securities, non-current | [1] | 111,289 | 130,092 |  |
Cost | [1] | 112,532 | 142,588 |  |
Fair Value | [1] | 115,428 | 141,430 |  |
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized Gains |  | 338 | 324 |  |
Unrealized Losses |  | (902) | (1,041) |  |
Fair Value |  | (564) | (717) |  |
Other Accrued Liabilities |  | $ (564) | $ (717) |  |
[1] | These investments are held in trust for settlement of the Company's vested and unvested obligations of $135.6 million and $138.8 million as of January 31, 2017 and April 30, 2016, respectively, under the ECAP (see Note 7 - Deferred Compensation and Retirement Plans). During the three and nine months ended January 31, 2017, the fair value of the investments increased; therefore, the Company recognized income of $3.9 million and $7.1 million, respectively, which was recorded in other income (loss), net. During the three and nine months ended January 31, 2016, the fair value of the investments decreased; therefore, the Company recognized a loss of $7.1 million and $8.9 million, respectively, which was recorded in other income (loss), net.

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