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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Apr. 30, 2022 | Apr. 30, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | $ 978,070 | $ 850,778
Marketable Securities, Current |  | 57,244 | 63,667
Marketable securities, non-current |  | 175,783 | 182,692
Other Accrued Liabilities |  | (204) | (12)
Fair Value |  | 1,210,893 | 1,097,125
Fair Value, Inputs, Level 2 |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 80,358 | 80,325
Unrealized Gains |  |  | 1
Unrealized Losses |  | (584) | (27)
Fair Value |  | 79,774 | 80,299
Cash and cash equivalents |  | 15,489 | 9,499
Marketable Securities, Current |  | 47,241 | 54,583
Marketable securities, non-current |  | 17,044 | 16,217
Fair Value, Inputs, Level 2 | Commercial Paper |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 41,627 | 51,979
Unrealized Gains |  |  | 1
Unrealized Losses |  | (126) | (7)
Fair Value |  | 41,501 | 51,973
Cash and cash equivalents |  | 15,489 | 9,499
Marketable Securities, Current |  | 26,012 | 42,474
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 37,736 | 26,371
Unrealized Losses |  | (450) | (20)
Fair Value |  | 37,286 | 26,351
Marketable Securities, Current |  | 20,242 | 10,134
Marketable securities, non-current |  | 17,044 | 16,217
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 995 | 1,975
Unrealized Losses |  | (8) |
Fair Value |  | 987 | 1,975
Marketable Securities, Current |  | 987 | 1,975
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |
Investment Holdings [Line Items] |  |  |
Other Accrued Liabilities |  | (204) | (12)
Fair Value |  | (204) | (12)
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current | [1] | 10,003 | 9,084
Marketable securities, non-current | [1] | 158,739 | 166,475
Fair Value | [1] | 168,742 | 175,559
Fair Value, Inputs, Level 1 | Equity Securities |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current |  | 10,003 | 9,084
Marketable securities, non-current |  | 158,739 | 166,475
Fair Value |  | 168,742 | 175,559
Fair Value, Inputs, Level 1 | Cash |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 874,490 | 752,737
Fair Value |  | 874,490 | 752,737
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 88,091 | 88,542
Fair Value |  | $ 88,091 | $ 88,542
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $160.8 million and $157.3 million as of April 30, 2022 and 2021, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $24.0 million and $26.5 million as of April 30, 2022 and 2021, respectively. During fiscal 2022 and 2020, the fair value of the investments decreased; therefore, the Company recognized a loss of $12.0 million and $1.8 million, respectively, which was recorded in other (loss) income, net. During fiscal 2021, the fair value of the investments increased; therefore, the Company recognized income of $38.5 million which was recorded in other (loss) income, net.

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