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Financial Instruments - Financial Instruments and Balance Sheet Classifications (Detail) - USD ($) $ in Thousands | Jul. 31, 2021 | Apr. 30, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | $ 649,304 | $ 850,778
Marketable Securities, Current |  | 68,247 | 63,667
Marketable securities, non-current |  | 186,735 | 182,692
Other Accrued Liabilities |  | (203) | (12)
Fair Value |  | 904,083 | 1,097,125
Fair Value, Inputs, Level 2 |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 73,914 | 80,325
Unrealized Gains |  | 4 | 1
Unrealized Losses |  | (25) | (27)
Fair Value |  | 73,893 | 80,299
Cash and cash equivalents |  |  | 9,499
Marketable Securities, Current |  | 58,497 | 54,583
Marketable securities, non-current |  | 15,396 | 16,217
Fair Value, Inputs, Level 2 | Commercial Paper |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 35,925 | 51,979
Unrealized Gains |  | 2 | 1
Unrealized Losses |  | (6) | (7)
Fair Value |  | 35,921 | 51,973
Cash and cash equivalents |  |  | 9,499
Marketable Securities, Current |  | 35,921 | 42,474
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 36,014 | 26,371
Unrealized Gains |  | 2 |
Unrealized Losses |  | (19) | (20)
Fair Value |  | 35,997 | 26,351
Marketable Securities, Current |  | 20,601 | 10,134
Marketable securities, non-current |  | 15,396 | 16,217
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 1,975 | 1,975
Fair Value |  | 1,975 | 1,975
Marketable Securities, Current |  | 1,975 | 1,975
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |
Investment Holdings [Line Items] |  |  |
Other Accrued Liabilities |  | (203) | (12)
Fair Value |  | (203) | (12)
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current | [1] | 9,750 | 9,084
Marketable securities, non-current | [1] | 171,339 | 166,475
Fair Value | [1] | 181,089 | 175,559
Fair Value, Inputs, Level 1 | Equity Securities |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current |  | 9,750 | 9,084
Marketable securities, non-current |  | 171,339 | 166,475
Fair Value |  | 181,089 | 175,559
Fair Value, Inputs, Level 1 | Cash |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 554,698 | 752,737
Fair Value |  | 554,698 | 752,737
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 94,606 | 88,542
Fair Value |  | $ 94,606 | $ 88,542
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $171.2 million and $157.3 million as of July 31, 2021 and April 30, 2021, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $24.7 million and $26.5 million as of July 31, 2021 and April 30, 2021, respectively. During the three months ended July 31, 2021 and 2020, the fair value of the investments increased; therefore, the Company recognized a gain of $5.2 million and $11.5 million, respectively, which was recorded in other income, net.

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