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Financial Instruments - Financial Instruments and Balance Sheet Classifications (Detail) - USD ($) $ in Thousands | Oct. 31, 2021 | Apr. 30, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | $ 725,391 | $ 850,778
Marketable Securities, Current |  | 77,496 | 63,667
Marketable securities, non-current |  | 194,047 | 182,692
Income taxes and other receivables |  | 564 |
Fair Value |  | 997,498 | 1,097,125
Other Accrued Liabilities |  |  | (12)
Fair Value, Inputs, Level 2 |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 80,383 | 80,325
Unrealized Gains |  | 1 | 1
Unrealized Losses |  | (51) | (27)
Fair Value |  | 80,333 | 80,299
Cash and cash equivalents |  |  | 9,499
Marketable Securities, Current |  | 67,421 | 54,583
Marketable securities, non-current |  | 12,912 | 16,217
Fair Value, Inputs, Level 2 | Commercial Paper |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 41,629 | 51,979
Unrealized Gains |  | 1 | 1
Unrealized Losses |  | (10) | (7)
Fair Value |  | 41,620 | 51,973
Cash and cash equivalents |  |  | 9,499
Marketable Securities, Current |  | 41,620 | 42,474
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 38,754 | 26,371
Unrealized Losses |  | (41) | (20)
Fair Value |  | 38,713 | 26,351
Marketable Securities, Current |  | 25,801 | 10,134
Marketable securities, non-current |  | 12,912 | 16,217
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |
Investment Holdings [Line Items] |  |  |
Income taxes and other receivables |  | 564 |
Fair Value |  | 564 | (12)
Other Accrued Liabilities |  |  | (12)
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 1 | Mutual Funds |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current | [1] | 10,075 | 9,084
Marketable securities, non-current | [1] | 181,135 | 166,475
Fair Value | [1] | 191,210 | 175,559
Fair Value, Inputs, Level 1 | Equity Securities |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current |  | 10,075 | 9,084
Marketable securities, non-current |  | 181,135 | 166,475
Fair Value |  | 191,210 | 175,559
Fair Value, Inputs, Level 1 | Cash |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 637,541 | 752,737
Fair Value |  | 637,541 | 752,737
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 87,850 | 88,542
Fair Value |  | $ 87,850 | $ 88,542
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $174.6 million and $157.3 million as of October 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 $26.7 million and $26.5 million as of October 31, 2021 and April 30, 2021, respectively. During the three and six months ended October 31, 2021, the fair value of the investments increased; therefore, the Company recognized a gain of $4.8 million and $10.0 million, respectively, which was recorded in other income, net. 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.

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