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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Oct. 31, 2018 | Apr. 30, 2018 | Oct. 31, 2017 | Apr. 30, 2017
--- | --- | --- | --- | ---
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 387,679 | $ 520,848 | $ 282,625 | $ 410,882
Marketable Securities, Current |  | 6,686 | 14,293 |  |
Marketable securities, non-current |  | 128,913 | 122,792 |  |
Income Taxes & Other Receivables |  | 29,009 | 29,089 |  |
Other Accrued Liabilities |  | (153,088) | (170,339) |  |
Fair Value, Inputs, Level 1 |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost |  | 520,881 | 647,925 |  |
Unrealized Gains |  | 5,061 | 11,040 |  |
Unrealized Losses |  | (2,664) | (1,032) |  |
Fair Value |  | 523,278 | 657,933 |  |
Cash and cash equivalents |  | 387,679 | 520,848 |  |
Marketable Securities, Current |  | 6,686 | 14,293 |  |
Marketable securities, non-current |  | 128,913 | 122,792 |  |
Fair Value, Inputs, Level 1 | Cash |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost |  | 366,549 | 519,818 |  |
Fair Value |  | 366,549 | 519,818 |  |
Cash and cash equivalents |  | 366,549 | 519,818 |  |
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost |  | 21,130 | 1,030 |  |
Fair Value |  | 21,130 | 1,030 |  |
Cash and cash equivalents |  | 21,130 | 1,030 |  |
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost | [1] | 133,202 | 127,077 |  |
Unrealized Gains | [1] | 5,061 | 11,040 |  |
Unrealized Losses | [1] | (2,664) | (1,032) |  |
Fair Value | [1] | 135,599 | 137,085 |  |
Marketable Securities, Current | [1] | 6,686 | 14,293 |  |
Marketable securities, non-current | [1] | 128,913 | 122,792 |  |
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized Gains |  | 1,436 | 1,778 |  |
Unrealized Losses |  | (2,150) | (1,025) |  |
Fair Value |  | (714) | 753 |  |
Income Taxes & Other Receivables |  |  | 753 |  |
Other Accrued Liabilities |  | (714) |  |  |
Fair Value, Inputs, Level 2 | Interest Rate Swap |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Fair Value |  | 2,452 | 2,076 |  |
Income Taxes & Other Receivables |  | 2,452 | 2,076 |  |
Unrealized Gains |  | $ 2,452 | $ 2,076 |  |
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $115.9 million and $118.2 million as of October 31, 2018 and April 30, 2018, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $24.2 million and $29.5 million as of October 31, 2018 and April 30, 2018, respectively. During the three and six months ended October 31, 2018, the fair value of the investments decreased; therefore, the Company recognized a loss of $4.8 million and $0.8 million, respectively, which was recorded in other (loss) income, net. During the three and six months ended October 31, 2017, the fair value of the investments increased; therefore, the Company recognized income of $3.4 million and $6.8 million, respectively, which was recorded in other (loss) income, net.

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