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Financial Instruments - Schedule of Financial Instruments and Balance Sheet Classification (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jul. 31, 2025 | Jul. 31, 2024 | Apr. 30, 2025
Fair Value Measurement |  |  |
Assets, fair value | $ 962,413 |  | $ 1,277,869
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 684,855 |  | 1,006,964
Marketable Securities, Current | 36,277 |  | 36,388
Marketable Securities, Non- current | 242,162 |  | 233,626
Other Accrued Liabilities | (881) |  |
Income Taxes & Other Receivables |  |  | 891
Mutual funds |  |  |
Balance Sheet Classification |  |  |
Obligations for which assets are held in trust | 223,800 |  | 205,300
Unvested obligations under deferred compensation plans | 14,200 |  | 19,500
Gain on marketable securities | 12,300 | $ 14,200 |
Fair Value, Inputs, Level 2 |  |  |
Fair Value Measurement |  |  |
Cost | 41,090 |  | 40,086
Unrealized Gains | 35 |  | 87
Unrealized Losses | (38) |  | (11)
Fair Value | 41,087 |  | 40,162
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 599 |  | 500
Marketable Securities, Current | 23,119 |  | 24,045
Marketable Securities, Non- current | 17,369 |  | 15,617
Other Accrued Liabilities | 0 |  |
Income Taxes & Other Receivables |  |  | 0
Fair Value, Inputs, Level 2 | Mutual funds |  |  |
Balance Sheet Classification |  |  |
Other Accrued Liabilities | 0 |  |
Fair Value, Inputs, Level 2 | Total equity investments |  |  |
Balance Sheet Classification |  |  |
Other Accrued Liabilities | 0 |  |
Fair Value, Inputs, Level 2 | Cash |  |  |
Balance Sheet Classification |  |  |
Other Accrued Liabilities | 0 |  |
Fair Value, Inputs, Level 2 | Money market funds |  |  |
Balance Sheet Classification |  |  |
Other Accrued Liabilities | 0 |  |
Fair Value, Inputs, Level 2 | Foreign currency forward contracts |  |  |
Fair Value Measurement |  |  |
Foreign currency forward contracts, fair value | (881) |  | 891
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
Fair Value, Inputs, Level 2 | Commercial paper |  |  |
Fair Value Measurement |  |  |
Cost | 4,630 |  | 3,842
Unrealized Gains | 0 |  | 0
Unrealized Losses | (3) |  | (1)
Fair Value | 4,627 |  | 3,841
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 599 |  | 500
Marketable Securities, Current | 4,028 |  | 3,341
Marketable Securities, Non- current | 0 |  | 0
Other Accrued Liabilities | 0 |  |
Income Taxes & Other Receivables |  |  | 0
Fair Value, Inputs, Level 2 | Corporate notes/bonds |  |  |
Fair Value Measurement |  |  |
Cost | 32,358 |  | 32,747
Unrealized Gains | 34 |  | 83
Unrealized Losses | (31) |  | (10)
Fair Value | 32,361 |  | 32,820
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 |  | 0
Marketable Securities, Current | 19,091 |  | 18,709
Marketable Securities, Non- current | 13,270 |  | 14,111
Other Accrued Liabilities | 0 |  |
Income Taxes & Other Receivables |  |  | 0
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities |  |  |
Fair Value Measurement |  |  |
Cost | 4,102 |  | 3,497
Unrealized Gains | 1 |  | 4
Unrealized Losses | (4) |  | 0
Fair Value | 4,099 |  | 3,501
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 |  | 0
Marketable Securities, Current | 0 |  | 1,995
Marketable Securities, Non- current | 4,099 |  | 1,506
Other Accrued Liabilities | 0 |  |
Income Taxes & Other Receivables |  |  | 0
Fair Value, Inputs, Level 1 | Mutual funds |  |  |
Fair Value Measurement |  |  |
Equity securities, fair value | 237,951 |  | 230,352
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 |  | 0
Marketable Securities, Current | 13,158 |  | 12,343
Marketable Securities, Non- current | 224,793 |  | 218,009
Income Taxes & Other Receivables |  |  | 0
Fair Value, Inputs, Level 1 | Total equity investments |  |  |
Fair Value Measurement |  |  |
Equity securities, fair value | 237,951 |  | 230,352
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 0 |  | 0
Marketable Securities, Current | 13,158 |  | 12,343
Marketable Securities, Non- current | 224,793 |  | 218,009
Income Taxes & Other Receivables |  |  | 0
Fair Value, Inputs, Level 1 | Cash |  |  |
Fair Value Measurement |  |  |
Cash and cash equivalents, fair value | 520,062 |  | 704,091
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 520,062 |  | 704,091
Marketable Securities, Current | 0 |  | 0
Marketable Securities, Non- current | 0 |  | 0
Income Taxes & Other Receivables |  |  | 0
Fair Value, Inputs, Level 1 | Money market funds |  |  |
Fair Value Measurement |  |  |
Cash and cash equivalents, fair value | 164,194 |  | 302,373
Balance Sheet Classification |  |  |
Cash and Cash Equivalents | 164,194 |  | 302,373
Marketable Securities, Current | 0 |  | 0
Marketable Securities, Non- current | 0 |  | 0
Income Taxes & Other Receivables |  |  | $ 0
Fair Value, Inputs, Level 1 | Foreign currency forward contracts |  |  |
Balance Sheet Classification |  |  |
Other Accrued Liabilities | $ (881) |  |

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