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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
--- | --- | --- | --- | ---
Investment Holdings [Line Items] |  |  |  |  |
Income Taxes & Other Receivables |  | $ 29,089 | $ 31,573 |  |
Other Accrued Liabilities |  | (170,339) | (148,464) |  |
Cash and cash equivalents |  | 520,848 | 410,882 | $ 273,252 | $ 380,838
Marketable Securities, Current |  | 14,293 | 4,363 |  |
Marketable securities, non-current |  | 122,792 | 115,574 |  |
Fair Value, Inputs, Level 1 |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost |  | 647,925 | 524,700 |  |
Unrealized Gains |  | 11,040 | 6,697 |  |
Unrealized Losses |  | (1,032) | (578) |  |
Fair Value |  | 657,933 | 530,819 |  |
Cash and cash equivalents |  | 520,848 | 410,882 |  |
Marketable Securities, Current |  | 14,293 | 4,363 |  |
Marketable securities, non-current |  | 122,792 | 115,574 |  |
Fair Value, Inputs, Level 1 | Cash |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 519,818 | 409,824 |  |
Cost |  | 519,818 | 409,824 |  |
Fair Value |  | 519,818 | 409,824 |  |
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 1,030 | 1,058 |  |
Fair Value |  | 1,030 | 1,058 |  |
Cost |  | 1,030 | 1,058 |  |
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized Gains | [1] | 11,040 | 6,697 |  |
Unrealized Losses | [1] | (1,032) | (578) |  |
Marketable Securities, Current | [1] | 14,293 | 4,363 |  |
Marketable securities, non-current | [1] | 122,792 | 115,574 |  |
Cost | [1] | 127,077 | 113,818 |  |
Fair Value | [1] | 137,085 | 119,937 |  |
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Income Taxes & Other Receivables |  | 753 |  |  |
Other Accrued Liabilities |  |  | (717) |  |
Unrealized Gains |  | 1,778 | 129 |  |
Unrealized Losses |  | (1,025) | (846) |  |
Fair Value |  | 753 | (717) |  |
Fair Value, Inputs, Level 2 | Interest Rate Swap |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized gains |  | 2,076 |  |  |
Unrealized Losses |  |  | (947) |  |
Fair Value |  | 2,076 | (947) |  |
Income Taxes & Other Receivables |  | $ 2,076 |  |  |
Other Accrued Liabilities |  |  | $ (947) |  |
[1] | These investments are held in trust for settlement of the Company's vested obligations of $118.2 million and $99.5 million as of April 30, 2018 and 2017, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During fiscal 2018 and 2017, the fair value of the investments increased; therefore, the Company recognized income of $10.3 million and $10.8 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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