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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Jul. 31, 2020 | Apr. 30, 2020
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | $ 542,786 | $ 689,244
Marketable Securities, Current |  | 49,870 | 41,951
Marketable securities, non-current |  | 140,330 | 132,134
Income Taxes & Other Receivables |  | 42,243 | 38,755
Income Taxes & Other Receivables |  | 406 | 2,634
Fair Value |  | 733,392 | 865,963
Fair Value, Inputs, Level 2 |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 40,125 | 38,313
Unrealized Gains |  | 41 | 65
Unrealized Losses |  | (8) | (19)
Fair Value |  | 40,158 | 38,359
Cash and cash equivalents |  | 1,800 | 5,686
Marketable Securities, Current |  | 38,358 | 32,673
Fair Value, Inputs, Level 2 | Commercial Paper |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 20,879 | 19,132
Unrealized Gains |  | 12 | 39
Unrealized Losses |  | (5) |
Fair Value |  | 20,886 | 19,171
Cash and cash equivalents |  | 1,800 | 4,785
Marketable Securities, Current |  | 19,086 | 14,386
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 19,246 | 19,181
Unrealized Gains |  | 29 | 26
Unrealized Losses |  | (3) | (19)
Fair Value |  | 19,272 | 19,188
Cash and cash equivalents |  |  | 901
Marketable Securities, Current |  | 19,272 | 18,287
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |
Investment Holdings [Line Items] |  |  |
Income Taxes & Other Receivables |  | 406 | 2,634
Fair Value |  | 406 | 2,634
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current | [1] | 11,512 | 9,278
Marketable securities, non-current | [1] | 140,330 | 132,134
Fair Value | [1] | 151,842 | 141,412
Fair Value, Inputs, Level 1 | Equity Securities |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current |  | 11,512 | 9,278
Marketable securities, non-current |  | 140,330 | 132,134
Fair Value |  | 151,842 | 141,412
Fair Value, Inputs, Level 1 | Cash |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 451,359 | 611,795
Fair Value |  | 451,359 | 611,795
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 89,627 | 71,763
Fair Value |  | $ 89,627 | $ 71,763
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $137.4 million and $124.6 million as of July 31, 2020 and April 30, 2020, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $24.1 million and $21.7 million as of July 31, 2020 and April 30, 2020, respectively. During the three months ended July 31, 2020 and 2019, the fair value of the investments increased; therefore, the Company recognized a gain of $11.5 million and $1.9 million, respectively, which was recorded in other income, net.

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