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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Oct. 31, 2020 | Apr. 30, 2020
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | $ 553,109 | $ 689,244
Marketable Securities, Current |  | 47,719 | 41,951
Marketable securities, non-current |  | 146,625 | 132,134
Other Accrued Liabilities |  | (113) |
Income Taxes & Other Receivables |  |  | 2,634
Fair Value |  | 747,340 | 865,963
Fair Value, Inputs, Level 2 |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 40,251 | 38,313
Unrealized Gains |  | 10 | 65
Unrealized Losses |  | (10) | (19)
Fair Value |  | 40,251 | 38,359
Cash and cash equivalents |  |  | 5,686
Marketable Securities, Current |  | 40,251 | 32,673
Fair Value, Inputs, Level 2 | Commercial Paper |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 21,386 | 19,132
Unrealized Gains |  | 3 | 39
Unrealized Losses |  | (3) |
Fair Value |  | 21,386 | 19,171
Cash and cash equivalents |  |  | 4,785
Marketable Securities, Current |  | 21,386 | 14,386
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 16,890 | 19,181
Unrealized Gains |  | 7 | 26
Unrealized Losses |  | (6) | (19)
Fair Value |  | 16,891 | 19,188
Cash and cash equivalents |  |  | 901
Marketable Securities, Current |  | 16,891 | 18,287
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 1,975 |
Unrealized Losses |  | (1) |
Fair Value |  | 1,974 |
Marketable Securities, Current |  | 1,974 |
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |
Investment Holdings [Line Items] |  |  |
Other Accrued Liabilities |  | (113) |
Income Taxes & Other Receivables |  |  | 2,634
Fair Value |  | (113) | 2,634
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current | [1] | 7,468 | 9,278
Marketable securities, non-current | [1] | 146,625 | 132,134
Fair Value | [1] | 154,093 | 141,412
Fair Value, Inputs, Level 1 | Equity Securities |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current |  | 7,468 | 9,278
Marketable securities, non-current |  | 146,625 | 132,134
Fair Value |  | 154,093 | 141,412
Fair Value, Inputs, Level 1 | Cash |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 463,916 | 611,795
Fair Value |  | 463,916 | 611,795
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 89,193 | 71,763
Fair Value |  | $ 89,193 | $ 71,763
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $133.8 million and $124.6 million as of October 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 $24.4 million and $21.7 million as of October 31, 2020 and April 30, 2020, respectively. During the three and six months ended October 31, 2020, the fair value of the investments increased; therefore, the Company recognized a gain of $0.6 million and $12.0 million, respectively, which was recorded in other income, net. 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, net.

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