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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Oct. 31, 2019 | Apr. 30, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | $ 464,423 | $ 626,360
Marketable Securities, Current |  | 6,508 | 8,288
Marketable securities, non-current |  | 138,055 | 132,463
Income Taxes & Other Receivables |  | 40,506 | 26,767
Other Accrued Liabilities |  | (158,071) | (162,047)
Fair Value, Inputs, Level 1 |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 602,024 | 761,799
Unrealized Gains |  | 7,560 | 6,301
Unrealized Losses |  | (598) | (989)
Fair Value |  | 608,986 | 767,111
Cash and cash equivalents |  | 464,423 | 626,360
Marketable Securities, Current |  | 6,508 | 8,288
Marketable securities, non-current |  | 138,055 | 132,463
Fair Value, Inputs, Level 1 | Cash |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 459,313 | 579,998
Fair Value |  | 459,313 | 579,998
Cash and cash equivalents |  | 459,313 | 579,998
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 5,110 | 46,362
Fair Value |  | 5,110 | 46,362
Cash and cash equivalents |  | 5,110 | 46,362
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |
Investment Holdings [Line Items] |  |  |
Cost | [1] | 137,601 | 135,439
Unrealized Gains | [1] | 7,560 | 6,301
Unrealized Losses | [1] | (598) | (989)
Fair Value | [1] | 144,563 | 140,751
Marketable Securities, Current | [1] | 6,508 | 8,288
Marketable securities, non-current | [1] | 138,055 | 132,463
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |
Investment Holdings [Line Items] |  |  |
Unrealized Gains |  | 1,301 | 821
Unrealized Losses |  | (548) | (722)
Fair Value |  | 753 | 99
Income Taxes & Other Receivables |  | 753 | 99
Fair Value, Inputs, Level 2 | Interest Rate Swap |  |  |
Investment Holdings [Line Items] |  |  |
Unrealized Losses |  | (666) |
Fair Value |  | (666) | 619
Income Taxes & Other Receivables |  |  | 619
Unrealized Gains |  |  | $ 619
Other Accrued Liabilities |  | $ (666) |
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $131.5 million and $122.3 million as of October 31, 2019 and April 30, 2019, respectively, under the ECAP (see Note 7 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $23.2 million and $24.6 million as of October 31, 2019 and April 30, 2019, respectively. During the three and six months ended October 31, 2019, the fair value of the investments increased; therefore, the Company recognized a gain of $1.2 million and $3.1 million, respectively, which was recorded in other income (loss), net. 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 income (loss), net.

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