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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
Fair Value Measurement |  |  |
Assets, fair value | $ 1,195,001 | $ 1,070,034 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 941,005 | 844,024 |
Marketable Securities, Current | 42,742 | 44,837 |
Marketable Securities, Non-current | 211,681 | 179,040 |
Other Accrued Liabilities | (427) |  |
Income Taxes & Other Receivables |  | 2,133 |
Obligations for which assets are held in trust | 198,600 | 172,200 |
Unvested obligations under deferred compensation plans | 22,400 | 21,900 |
Gain (loss) on marketable securities | 29,800 | 2,900 | $ (12,000)
Level 2 |  |  |
Fair Value Measurement |  |  |
Cost | 38,550 | 36,505 |
Unrealized Gains | 4 | 0 |
Unrealized Losses | (55) | (385) |
Fair Value | 38,499 | 36,120 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 3,932 | 0 |
Marketable Securities, Current | 25,414 | 33,213 |
Marketable Securities, Non-current | 9,153 | 2,907 |
Other Accrued Liabilities | 0 |  |
Income Taxes & Other Receivables |  | 0 |
Level 2 | Foreign currency forward contracts |  |  |
Fair Value Measurement |  |  |
Foreign currency forward contracts, fair value | (427) | 2,133 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 | 0 |
Marketable Securities, Current | 0 | 0 |
Marketable Securities, Non-current | 0 | 0 |
Other Accrued Liabilities | (427) |  |
Income Taxes & Other Receivables |  | 2,133 |
Level 2 | Commercial paper |  |  |
Fair Value Measurement |  |  |
Cost | 16,873 | 11,751 |
Unrealized Gains | 1 | 0 |
Unrealized Losses | (19) | (30) |
Fair Value | 16,855 | 11,721 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 3,932 | 0 |
Marketable Securities, Current | 12,923 | 11,721 |
Marketable Securities, Non-current | 0 | 0 |
Other Accrued Liabilities | 0 |  |
Income Taxes & Other Receivables |  | 0 |
Level 2 | Corporate notes/bonds |  |  |
Fair Value Measurement |  |  |
Cost | 17,322 | 24,754 |
Unrealized Gains | 3 | 0 |
Unrealized Losses | (27) | (355) |
Fair Value | 17,298 | 24,399 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 | 0 |
Marketable Securities, Current | 10,050 | 21,492 |
Marketable Securities, Non-current | 7,248 | 2,907 |
Other Accrued Liabilities | 0 |  |
Income Taxes & Other Receivables |  | 0 |
Level 2 | U.S. Treasury and Agency Securities |  |  |
Fair Value Measurement |  |  |
Cost | 4,355 |  |
Unrealized Gains | 0 |  |
Unrealized Losses | (9) |  |
Fair Value | 4,346 |  |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 |  |
Marketable Securities, Current | 2,441 |  |
Marketable Securities, Non-current | 1,905 |  |
Other Accrued Liabilities | 0 |  |
Level 1 | Mutual funds |  |  |
Fair Value Measurement |  |  |
Equity securities, fair value | 219,856 | 187,757 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 | 0 |
Marketable Securities, Current | 17,328 | 11,624 |
Marketable Securities, Non-current | 202,528 | 176,133 |
Other Accrued Liabilities | 0 |  |
Income Taxes & Other Receivables |  | 0 |
Level 1 | Total equity investments |  |  |
Fair Value Measurement |  |  |
Equity securities, fair value | 219,856 | 187,757 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 | 0 |
Marketable Securities, Current | 17,328 | 11,624 |
Marketable Securities, Non-current | 202,528 | 176,133 |
Other Accrued Liabilities | 0 |  |
Income Taxes & Other Receivables |  | 0 |
Level 1 | Cash |  |  |
Fair Value Measurement |  |  |
Cash and cash equivalents, fair value | 790,938 | 696,180 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 790,938 | 696,180 |
Marketable Securities, Current | 0 | 0 |
Marketable Securities, Non-current | 0 | 0 |
Other Accrued Liabilities | 0 |  |
Income Taxes & Other Receivables |  | 0 |
Level 1 | Money market funds |  |  |
Fair Value Measurement |  |  |
Cash and cash equivalents, fair value | 146,135 | 147,844 |
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 146,135 | 147,844 |
Marketable Securities, Current | 0 | 0 |
Marketable Securities, Non-current | 0 | 0 |
Other Accrued Liabilities | $ 0 |  |
Income Taxes & Other Receivables |  | $ 0 |

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