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Financial Instruments - Financial Instruments and Balance Sheet Classifications (Detail) - USD ($) $ in Thousands | Jan. 31, 2022 | Apr. 30, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | $ 846,505 | $ 850,778
Marketable Securities, Current |  | 73,110 | 63,667
Marketable securities, non-current |  | 187,635 | 182,692
Income Taxes & Other Receivables |  | 1,491 |
Fair Value |  | 1,108,741 | 1,097,125
Other Accrued Liabilities |  |  | (12)
Fair Value, Inputs, Level 2 |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 80,308 | 80,325
Unrealized Gains |  |  | 1
Unrealized Losses |  | (205) | (27)
Fair Value |  | 80,103 | 80,299
Cash and cash equivalents |  | 3,499 | 9,499
Marketable Securities, Current |  | 61,205 | 54,583
Marketable securities, non-current |  | 15,399 | 16,217
Fair Value, Inputs, Level 2 | Commercial Paper |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 38,857 | 51,979
Unrealized Gains |  |  | 1
Unrealized Losses |  | (34) | (7)
Fair Value |  | 38,823 | 51,973
Cash and cash equivalents |  | 1,999 | 9,499
Marketable Securities, Current |  | 36,824 | 42,474
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 39,951 | 26,371
Unrealized Losses |  | (171) | (20)
Fair Value |  | 39,780 | 26,351
Marketable Securities, Current |  | 24,381 | 10,134
Marketable securities, non-current |  | 15,399 | 16,217
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 1,500 | 1,975
Fair Value |  | 1,500 | 1,975
Cash and cash equivalents |  | 1,500 |
Marketable Securities, Current |  |  | 1,975
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |
Investment Holdings [Line Items] |  |  |
Income Taxes & Other Receivables |  | 1,491 |
Fair Value |  | 1,491 | (12)
Other Accrued Liabilities |  |  | (12)
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current | [1] | 11,905 | 9,084
Marketable securities, non-current | [1] | 172,236 | 166,475
Fair Value | [1] | 184,141 | 175,559
Fair Value, Inputs, Level 1 | Equity Securities |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current |  | 11,905 | 9,084
Marketable securities, non-current |  | 172,236 | 166,475
Fair Value |  | 184,141 | 175,559
Fair Value, Inputs, Level 1 | Cash |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 754,823 | 752,737
Fair Value |  | 754,823 | 752,737
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 88,183 | 88,542
Fair Value |  | $ 88,183 | $ 88,542
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $175.2 million and $157.3 million as of January 31, 2022 and April 30, 2021, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $25.9 million and $26.5 million as of January 31, 2022 and April 30, 2021, respectively. During the three months ended January 31, 2022, the fair value of the investments decreased; therefore, the Company recognized a loss of $7.7 million, which was recorded in other (loss) income, net. During the nine months ended January 31, 2022, the fair value increased; therefore, the Company recognized a gain of $2.4 million, which was recorded in other (loss) income, net. During the three and nine months ended January 31, 2021, the fair value of the investments increased; therefore, the Company recognized a gain of $15.2 million and $27.2 million, respectively, which was recorded in other (loss) income, net.

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