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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 | Oct. 31, 2016 | Apr. 30, 2016 | Oct. 31, 2015 | Apr. 30, 2015
--- | --- | --- | --- | ---
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 250,033 | $ 273,252 | $ 270,743 | $ 380,838
Marketable Securities, Current |  | 29,766 | 11,338 |  |
Marketable securities, non-current |  | 110,217 | 130,092 |  |
Other Accrued Liabilities |  | (138,738) | (145,023) |  |
Income Taxes & Other Receivables |  | 23,455 | 20,579 |  |
Fair Value, Inputs, Level 1 |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost |  | 388,564 | 415,840 |  |
Unrealized Gains |  | 2,431 | 1,395 |  |
Unrealized Losses |  | (979) | (2,553) |  |
Fair Value |  | 390,016 | 414,682 |  |
Cash and cash equivalents |  | 250,033 | 273,252 |  |
Marketable Securities, Current |  | 29,766 | 11,338 |  |
Marketable securities, non-current |  | 110,217 | 130,092 |  |
Fair Value, Inputs, Level 1 | Cash |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 119,276 | 155,702 |  |
Cost |  | 119,276 | 155,702 |  |
Fair Value |  | 119,276 | 155,702 |  |
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 130,757 | 117,550 |  |
Fair Value |  | 130,757 | 117,550 |  |
Cost |  | 130,757 | 117,550 |  |
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized Gains | [1] | 2,431 | 1,395 |  |
Unrealized Losses | [1] | (979) | (2,553) |  |
Marketable Securities, Current | [1] | 29,766 | 11,338 |  |
Marketable securities, non-current | [1] | 110,217 | 130,092 |  |
Cost | [1] | 138,531 | 142,588 |  |
Fair Value | [1] | 139,983 | 141,430 |  |
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized Gains |  | 551 | 324 |  |
Unrealized Losses |  | (93) | (1,041) |  |
Fair Value |  | 458 | (717) |  |
Other Accrued Liabilities |  |  | $ (717) |  |
Income Taxes & Other Receivables |  | $ 458 |  |  |
[1] | These investments are held in trust for settlement of the Company's vested and unvested obligations of $133.7 million and $138.8 million as of October 31, 2016 and April 30, 2016, respectively, under the ECAP (see Note 7 - Deferred Compensation and Retirement Plans). During the three months ended October 31, 2016, the fair value of the investments decreased; therefore, the Company recognized a loss of $0.7 million, which was recorded in other (loss) income, net. During the six months ended October 31, 2016, the fair value of the investments increased; therefore, the Company recognized income of $3.2 million, which was recorded in other (loss) income, net. During the three and six months ended October 31, 2015, the fair value of the investments decreased; therefore, the Company recognized a loss of $2.5 million and $1.8 million, respectively, which was recorded in other (loss) income, net.

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