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Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
--- | --- | --- | --- | ---
Investment Holdings [Line Items] |  |  |  |  |
Other Accrued Liabilities |  | $ (148,464) | $ (145,023) |  |
Cash and cash equivalents |  | 410,882 | 273,252 | $ 380,838 | $ 333,717
Marketable Securities, Current |  | 4,363 | 11,338 |  |
Marketable securities, non-current |  | 115,574 | 130,092 |  |
Fair Value, Inputs, Level 1 |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost |  | 524,700 | 415,840 |  |
Unrealized Gains |  | 6,697 | 1,395 |  |
Unrealized Losses |  | (578) | (2,553) |  |
Fair Value |  | 530,819 | 414,682 |  |
Cash and cash equivalents |  | 410,882 | 273,252 |  |
Marketable Securities, Current |  | 4,363 | 11,338 |  |
Marketable securities, non-current |  | 115,574 | 130,092 |  |
Fair Value, Inputs, Level 1 | Cash |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 409,824 | 269,558 |  |
Cost |  | 409,824 | 269,558 |  |
Fair Value |  | 409,824 | 269,558 |  |
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 1,058 | 3,694 |  |
Fair Value |  | 1,058 | 3,694 |  |
Cost |  | 1,058 | 3,694 |  |
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized Gains | [1] | 6,697 | 1,395 |  |
Unrealized Losses | [1] | (578) | (2,553) |  |
Marketable Securities, Current | [1] | 4,363 | 11,338 |  |
Marketable securities, non-current | [1] | 115,574 | 130,092 |  |
Cost | [1] | 113,818 | 142,588 |  |
Fair Value | [1] | 119,937 | 141,430 |  |
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Other Accrued Liabilities |  | (717) | (717) |  |
Unrealized Gains |  | 129 | 324 |  |
Unrealized Losses |  | (846) | (1,041) |  |
Fair Value |  | (717) | $ (717) |  |
Fair Value, Inputs, Level 2 | Interest Rate Swap |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized Losses |  | (947) |  |  |
Fair Value |  | (947) |  |  |
Other Accrued Liabilities |  | $ (947) |  |  |
[1] | These investments are held in trust for settlement of the Company's vested and unvested obligations of $137.1 million and $138.8 million as of April 30, 2017 and 2016, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During fiscal 2017 and 2015, the fair value of the investments increased; therefore, the Company recognized income of $10.8 million and $8.8 million, respectively which was recorded in other income (loss), net. During fiscal 2016, the fair value of the investments decreased; therefore, the Company recognized a loss of $3.3 million, which was recorded in other income (loss), net.

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