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Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Jul. 31, 2017 | Apr. 30, 2017 | Jul. 31, 2016 | Apr. 30, 2016
--- | --- | --- | --- | ---
Investment Holdings [Line Items] |  |  |  |  |
Other Accrued Liabilities |  | $ (153,386) | $ (148,464) |  |
Cash and cash equivalents |  | 282,019 | 410,882 | $ 244,073 | $ 273,252
Marketable Securities, Current |  | 11,651 | 4,363 |  |
Marketable securities, non-current |  | 114,608 | 115,574 |  |
Income Taxes & Other Receivables |  | 44,035 | 31,573 |  |
Fair Value, Inputs, Level 1 |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost |  | 399,241 | 524,700 |  |
Unrealized Gains |  | 9,533 | 6,697 |  |
Unrealized Losses |  | (496) | (578) |  |
Fair Value |  | 408,278 | 530,819 |  |
Cash and cash equivalents |  | 282,019 | 410,882 |  |
Marketable Securities, Current |  | 11,651 | 4,363 |  |
Marketable securities, non-current |  | 114,608 | 115,574 |  |
Fair Value, Inputs, Level 1 | Cash |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 280,961 | 409,824 |  |
Cost |  | 280,961 | 409,824 |  |
Fair Value |  | 280,961 | 409,824 |  |
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 1,058 | 1,058 |  |
Fair Value |  | 1,058 | 1,058 |  |
Cost |  | 1,058 | 1,058 |  |
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized Gains | [1] | 9,533 | 6,697 |  |
Unrealized Losses | [1] | (496) | (578) |  |
Marketable Securities, Current | [1] | 11,651 | 4,363 |  |
Marketable securities, non-current | [1] | 114,608 | 115,574 |  |
Cost | [1] | 117,222 | 113,818 |  |
Fair Value | [1] | 126,259 | 119,937 |  |
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Other Accrued Liabilities |  | (315) | (717) |  |
Unrealized Gains |  | 386 | 129 |  |
Unrealized Losses |  | (400) | (846) |  |
Fair Value |  | (14) | (717) |  |
Income Taxes & Other Receivables |  | 301 |  |  |
Fair Value, Inputs, Level 2 | Interest Rate Swap |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized Losses |  | (1,050) | (947) |  |
Fair Value |  | (1,050) | (947) |  |
Other Accrued Liabilities |  | $ (1,050) | $ (947) |  |
[1] | These investments are held in trust for settlement of the Company's vested obligations of $116.2 million and $99.5 million as of July 31, 2017 and April 30, 2017, respectively, under the ECAP (see Note 7 - Deferred Compensation and Retirement Plans). During the three months ended July 31, 2017 and 2016, the fair value of the investments increased; therefore, the Company recognized income of $3.4 million and $3.9 million, respectively, which was recorded in other income, net.

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