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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Apr. 30, 2021 | Apr. 30, 2020
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | $ 850,778 | $ 689,244
Marketable Securities, Current |  | 63,667 | 41,951
Marketable securities, non-current |  | 182,692 | 132,134
Other Accrued Liabilities |  | (12) |
Income Taxes & Other Receivables |  |  | 2,634
Fair Value |  | 1,097,125 | 865,963
Fair Value, Inputs, Level 2 |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 80,325 | 38,313
Unrealized Gains |  | 1 | 65
Unrealized Losses |  | (27) | (19)
Fair Value |  | 80,299 | 38,359
Cash and cash equivalents |  | 9,499 | 5,686
Marketable Securities, Current |  | 54,583 | 32,673
Marketable securities, non-current |  | 16,217 |
Fair Value, Inputs, Level 2 | Commercial Paper |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 51,979 | 19,132
Unrealized Gains |  | 1 | 39
Unrealized Losses |  | (7) |
Fair Value |  | 51,973 | 19,171
Cash and cash equivalents |  | 9,499 | 4,785
Marketable Securities, Current |  | 42,474 | 14,386
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 26,371 | 19,181
Unrealized Gains |  |  | 26
Unrealized Losses |  | (20) | (19)
Fair Value |  | 26,351 | 19,188
Cash and cash equivalents |  |  | 901
Marketable Securities, Current |  | 10,134 | 18,287
Marketable securities, non-current |  | 16,217 |
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 1,975 |
Fair Value |  | 1,975 |
Marketable Securities, Current |  | 1,975 |
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |
Investment Holdings [Line Items] |  |  |
Other Accrued Liabilities |  | (12) |
Income Taxes & Other Receivables |  |  | 2,634
Fair Value |  | (12) | 2,634
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current | [1] | 9,084 | 9,278
Marketable securities, non-current | [1] | 166,475 | 132,134
Fair Value | [1] | 175,559 | 141,412
Fair Value, Inputs, Level 1 | Equity Securities |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current |  | 9,084 | 9,278
Marketable securities, non-current |  | 166,475 | 132,134
Fair Value |  | 175,559 | 141,412
Fair Value, Inputs, Level 1 | Cash |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 752,737 | 611,795
Fair Value |  | 752,737 | 611,795
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 88,542 | 71,763
Fair Value |  | $ 88,542 | $ 71,763
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $157.3 million and $124.6 million as of April 30, 2021 and 2020, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $26.5 million and $21.7 million as of April 30, 2021 and 2020, respectively. During fiscal 2021 and 2019, the fair value of the investments increased; therefore, the Company recognized income of $38.5 million and $8.1 million, respectively, which was recorded in other income (loss), net. During fiscal 2020, the fair value of the investments decreased; therefore, the Company recognized a loss of $1.8 million which was recorded in other income (loss), net.

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