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Financial Instruments - Schedule of Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2025 | Apr. 30, 2024 | Apr. 30, 2023
Fair Value Measurement |  |  |
Assets, fair value | $ 1,277,869 | $ 1,195,001 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 1,006,964 | 941,005 |
Marketable Securities, Current | 36,388 | 42,742 |
Marketable Securities, Non-current | 233,626 | 211,681 |
Income Taxes & Other Receivables | 891 |  |
Other Accrued Liabilities |  | (427) |
Gain (loss) on marketable securities | 17,100 | 29,800 | $ 2,900
Mutual funds |  |  |
Balance Sheet Classification |  |  |
Obligations for which assets are held in trust | 205,300 | 198,600 |
Unvested obligations under deferred compensation plans | 19,500 | 22,400 |
Gain (loss) on marketable securities | 17,100 | 29,800 | $ 2,900
Level 2 |  |  |
Fair Value Measurement |  |  |
Cost | 40,086 | 38,550 |
Unrealized Gains | 87 | 4 |
Unrealized Losses | (11) | (55) |
Fair Value | 40,162 | 38,499 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 500 | 3,932 |
Marketable Securities, Current | 24,045 | 25,414 |
Marketable Securities, Non-current | 15,617 | 9,153 |
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  | 0 |
Level 2 | Foreign currency forward contracts |  |  |
Fair Value Measurement |  |  |
Foreign currency forward contracts, fair value | 891 | (427) |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 | 0 |
Marketable Securities, Current | 0 | 0 |
Marketable Securities, Non-current | 0 | 0 |
Income Taxes & Other Receivables | 891 |  |
Other Accrued Liabilities |  | (427) |
Level 2 | Commercial paper |  |  |
Fair Value Measurement |  |  |
Cost | 3,842 | 16,873 |
Unrealized Gains | 0 | 1 |
Unrealized Losses | (1) | (19) |
Fair Value | 3,841 | 16,855 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 500 | 3,932 |
Marketable Securities, Current | 3,341 | 12,923 |
Marketable Securities, Non-current | 0 | 0 |
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  | 0 |
Level 2 | Corporate notes/bonds |  |  |
Fair Value Measurement |  |  |
Cost | 32,747 | 17,322 |
Unrealized Gains | 83 | 3 |
Unrealized Losses | (10) | (27) |
Fair Value | 32,820 | 17,298 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 | 0 |
Marketable Securities, Current | 18,709 | 10,050 |
Marketable Securities, Non-current | 14,111 | 7,248 |
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  | 0 |
Level 2 | U.S. Treasury and Agency Securities |  |  |
Fair Value Measurement |  |  |
Cost | 3,497 | 4,355 |
Unrealized Gains | 4 | 0 |
Unrealized Losses | 0 | (9) |
Fair Value | 3,501 | 4,346 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 | 0 |
Marketable Securities, Current | 1,995 | 2,441 |
Marketable Securities, Non-current | 1,506 | 1,905 |
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  | 0 |
Level 1 | Mutual funds |  |  |
Fair Value Measurement |  |  |
Equity securities, fair value | 230,352 | 219,856 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 | 0 |
Marketable Securities, Current | 12,343 | 17,328 |
Marketable Securities, Non-current | 218,009 | 202,528 |
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  | 0 |
Level 1 | Total equity investments |  |  |
Fair Value Measurement |  |  |
Equity securities, fair value | 230,352 | 219,856 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 | 0 |
Marketable Securities, Current | 12,343 | 17,328 |
Marketable Securities, Non-current | 218,009 | 202,528 |
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  | 0 |
Level 1 | Cash |  |  |
Fair Value Measurement |  |  |
Cash and cash equivalents, fair value | 704,091 | 790,938 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 704,091 | 790,938 |
Marketable Securities, Current | 0 | 0 |
Marketable Securities, Non-current | 0 | 0 |
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  | 0 |
Level 1 | Money market funds |  |  |
Fair Value Measurement |  |  |
Cash and cash equivalents, fair value | 302,373 | 146,135 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 302,373 | 146,135 |
Marketable Securities, Current | 0 | 0 |
Marketable Securities, Non-current | 0 | 0 |
Income Taxes & Other Receivables | $ 0 |  |
Other Accrued Liabilities |  | $ 0 |

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