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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Jul. 31, 2022 | Apr. 30, 2022
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | $ 639,784 | $ 978,070
Marketable Securities, Current |  | 71,172 | 57,244
Marketable securities, non-current |  | 185,492 | 175,783
Income Taxes & Other Receivables |  | 497 |
Fair Value |  | 896,945 | 1,210,893
Other Accrued Liabilities |  |  | (204)
Fair Value, Inputs, Level 2 |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 80,305 | 80,358
Unrealized Gains |  | 8 |
Unrealized Losses |  | (660) | (584)
Fair Value |  | 79,653 | 79,774
Cash and cash equivalents |  |  | 15,489
Marketable Securities, Current |  | 60,653 | 47,241
Marketable securities, non-current |  | 19,000 | 17,044
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |
Investment Holdings [Line Items] |  |  |
Income Taxes & Other Receivables |  | 497 |
Fair Value |  | 497 | (204)
Other Accrued Liabilities |  |  | (204)
Fair Value, Inputs, Level 2 | Commercial Paper |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 35,709 | 41,627
Unrealized Losses |  | (180) | (126)
Fair Value |  | 35,529 | 41,501
Cash and cash equivalents |  |  | 15,489
Marketable Securities, Current |  | 35,529 | 26,012
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 43,600 | 37,736
Unrealized Gains |  | 8 |
Unrealized Losses |  | (470) | (450)
Fair Value |  | 43,138 | 37,286
Marketable Securities, Current |  | 24,138 | 20,242
Marketable securities, non-current |  | 19,000 | 17,044
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 996 | 995
Unrealized Losses |  | (10) | (8)
Fair Value |  | 986 | 987
Marketable Securities, Current |  | 986 | 987
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current | [1] | 10,519 | 10,003
Marketable securities, non-current | [1] | 166,492 | 158,739
Fair Value | [1] | 177,011 | 168,742
Fair Value, Inputs, Level 1 | Equity Securities |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current |  | 10,519 | 10,003
Marketable securities, non-current |  | 166,492 | 158,739
Fair Value |  | 177,011 | 168,742
Fair Value, Inputs, Level 1 | Cash |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 577,195 | 874,490
Fair Value |  | 577,195 | 874,490
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 62,589 | 88,091
Fair Value |  | $ 62,589 | $ 88,091
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $178.8 million and $160.8 million as of July 31, 2022 and April 30, 2022, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $17.5 million and $24.0 million as of July 31, 2022 and April 30, 2022, respectively. During the three months ended July 31, 2022 and 2021, the fair value of the investments increased; therefore, the Company recognized a gain of $0.1 million and $5.2 million, respectively, which was recorded in other income, net.

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