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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jul. 31, 2024 | Jul. 31, 2023 | Apr. 30, 2024
Fair Value Measurement |  |  |
Assets, fair value | $ 905,605 |  | $ 1,195,001
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 633,376 |  | 941,005
Marketable Securities, Current | 40,626 |  | 42,742
Marketable Securities, Non- current | 231,195 |  | 211,681
Income Taxes & Other Receivables | 408 |  |
Other Accrued Liabilities |  |  | (427)
Mutual funds |  |  |
Balance Sheet Classification |  |  |
Obligations for which assets are held in trust | 214,500 |  | 198,600
Unvested obligations under deferred compensation plans | 16,700 |  | 22,400
Gain on marketable securities | 14,200 | $ 12,800 |
Fair Value, Inputs, Level 2 |  |  |
Fair Value Measurement |  |  |
Cost | 39,203 |  | 38,550
Unrealized Gains | 54 |  | 4
Unrealized Losses | (19) |  | (55)
Fair Value | 39,238 |  | 38,499
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 |  | 3,932
Marketable Securities, Current | 28,124 |  | 25,414
Marketable Securities, Non- current | 11,114 |  | 9,153
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  |  | 0
Fair Value, Inputs, Level 2 | Foreign currency forward contracts |  |  |
Fair Value Measurement |  |  |
Foreign currency forward contracts, fair value | 408 |  | (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 | 408 |  |
Other Accrued Liabilities |  |  | (427)
Fair Value, Inputs, Level 2 | Commercial paper |  |  |
Fair Value Measurement |  |  |
Cost | 12,163 |  | 16,873
Unrealized Gains | 0 |  | 1
Unrealized Losses | (9) |  | (19)
Fair Value | 12,154 |  | 16,855
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 |  | 3,932
Marketable Securities, Current | 12,154 |  | 12,923
Marketable Securities, Non- current | 0 |  | 0
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  |  | 0
Fair Value, Inputs, Level 2 | Corporate notes/bonds |  |  |
Fair Value Measurement |  |  |
Cost | 20,173 |  | 17,322
Unrealized Gains | 52 |  | 3
Unrealized Losses | (7) |  | (27)
Fair Value | 20,218 |  | 17,298
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 |  | 0
Marketable Securities, Current | 10,600 |  | 10,050
Marketable Securities, Non- current | 9,618 |  | 7,248
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  |  | 0
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities |  |  |
Fair Value Measurement |  |  |
Cost | 6,867 |  | 4,355
Unrealized Gains | 2 |  | 0
Unrealized Losses | (3) |  | (9)
Fair Value | 6,866 |  | 4,346
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 |  | 0
Marketable Securities, Current | 5,370 |  | 2,441
Marketable Securities, Non- current | 1,496 |  | 1,905
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  |  | 0
Fair Value, Inputs, Level 1 | Mutual funds |  |  |
Fair Value Measurement |  |  |
Equity securities, fair value | 232,583 |  | 219,856
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 |  | 0
Marketable Securities, Current | 12,502 |  | 17,328
Marketable Securities, Non- current | 220,081 |  | 202,528
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  |  | 0
Fair Value, Inputs, Level 1 | Equity investments |  |  |
Fair Value Measurement |  |  |
Equity securities, fair value | 232,583 |  | 219,856
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 |  | 0
Marketable Securities, Current | 12,502 |  | 17,328
Marketable Securities, Non- current | 220,081 |  | 202,528
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  |  | 0
Fair Value, Inputs, Level 1 | Cash |  |  |
Fair Value Measurement |  |  |
Cash and cash equivalents, fair value | 540,650 |  | 790,938
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 540,650 |  | 790,938
Marketable Securities, Current | 0 |  | 0
Marketable Securities, Non- current | 0 |  | 0
Income Taxes & Other Receivables | 0 |  |
Other Accrued Liabilities |  |  | 0
Fair Value, Inputs, Level 1 | Money market funds |  |  |
Fair Value Measurement |  |  |
Cash and cash equivalents, fair value | 92,726 |  | 146,135
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 92,726 |  | 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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