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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2023 | Jan. 31, 2022 | Jan. 31, 2023 | Jan. 31, 2022 | Apr. 30, 2022
Fair Value Measurement |  |  |  |  |
Assets, fair value | $ 1,009,100 |  | $ 1,009,100 |  | $ 1,210,893
Balance Sheet Classification |  |  |  |  |
Cash and Cash Equivalents | 771,898 |  | 771,898 |  | 978,070
Marketable Securities, Current | 48,253 |  | 48,253 |  | 57,244
Marketable Securities, Non- current | 187,646 |  | 187,646 |  | 175,783
Income Taxes & Other Receivables | 1,303 |  | 1,303 |  |
Other Accrued Liabilities |  |  |  |  | (204)
Obligations for which assets are held in trust | 173,700 |  | 173,700 |  | 160,800
Unvested obligations under deferred compensation plans | 22,300 |  | 22,300 |  | 24,000
Gain (loss) on marketable securities | 12,700 | $ (7,700) | 3,000 | $ 2,400 |
Fair Value, Inputs, Level 2 |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Cost | 47,657 |  | 47,657 |  | 80,358
Unrealized Gains | 1 |  | 1 |  | 0
Unrealized Losses | (568) |  | (568) |  | (584)
Debt securities AFS, fair value | 47,090 |  | 47,090 |  | 79,774
Balance Sheet Classification |  |  |  |  |
Cash and Cash Equivalents | 0 |  | 0 |  | 15,489
Marketable Securities, Current | 39,787 |  | 39,787 |  | 47,241
Marketable Securities, Non- current | 7,303 |  | 7,303 |  | 17,044
Income Taxes & Other Receivables | 0 |  | 0 |  |
Other Accrued Liabilities |  |  |  |  | 0
Fair Value, Inputs, Level 2 | Foreign currency forward contracts |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Foreign currency forward contracts, fair value | 1,303 |  | 1,303 |  | (204)
Balance Sheet Classification |  |  |  |  |
Cash and Cash Equivalents | 0 |  | 0 |  | 0
Marketable Securities, Current | 0 |  | 0 |  | 0
Marketable Securities, Non- current | 0 |  | 0 |  | 0
Income Taxes & Other Receivables | 1,303 |  | 1,303 |  |
Other Accrued Liabilities |  |  |  |  | (204)
Fair Value, Inputs, Level 2 | Commercial paper |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Cost | 16,294 |  | 16,294 |  | 41,627
Unrealized Gains | 0 |  | 0 |  | 0
Unrealized Losses | (79) |  | (79) |  | (126)
Debt securities AFS, fair value | 16,215 |  | 16,215 |  | 41,501
Balance Sheet Classification |  |  |  |  |
Cash and Cash Equivalents | 0 |  | 0 |  | 15,489
Marketable Securities, Current | 16,215 |  | 16,215 |  | 26,012
Marketable Securities, Non- current | 0 |  | 0 |  | 0
Income Taxes & Other Receivables | 0 |  | 0 |  |
Other Accrued Liabilities |  |  |  |  | 0
Fair Value, Inputs, Level 2 | Corporate notes/bonds |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Cost | 31,363 |  | 31,363 |  | 37,736
Unrealized Gains | 1 |  | 1 |  | 0
Unrealized Losses | (489) |  | (489) |  | (450)
Debt securities AFS, fair value | 30,875 |  | 30,875 |  | 37,286
Balance Sheet Classification |  |  |  |  |
Cash and Cash Equivalents | 0 |  | 0 |  | 0
Marketable Securities, Current | 23,572 |  | 23,572 |  | 20,242
Marketable Securities, Non- current | 7,303 |  | 7,303 |  | 17,044
Income Taxes & Other Receivables | 0 |  | 0 |  |
Other Accrued Liabilities |  |  |  |  | 0
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Cost |  |  |  |  | 995
Unrealized Gains |  |  |  |  | 0
Unrealized Losses |  |  |  |  | (8)
Debt securities AFS, fair value |  |  |  |  | 987
Balance Sheet Classification |  |  |  |  |
Cash and Cash Equivalents |  |  |  |  | 0
Marketable Securities, Current |  |  |  |  | 987
Marketable Securities, Non- current |  |  |  |  | 0
Other Accrued Liabilities |  |  |  |  | 0
Fair Value, Inputs, Level 1 | Mutual funds |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Equity securities, fair value | 188,809 |  | 188,809 |  | 168,742
Balance Sheet Classification |  |  |  |  |
Cash and Cash Equivalents | 0 |  | 0 |  | 0
Marketable Securities, Current | 8,466 |  | 8,466 |  | 10,003
Marketable Securities, Non- current | 180,343 |  | 180,343 |  | 158,739
Income Taxes & Other Receivables | 0 |  | 0 |  |
Other Accrued Liabilities |  |  |  |  | 0
Fair Value, Inputs, Level 1 | Total equity investments |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Equity securities, fair value | 188,809 |  | 188,809 |  | 168,742
Balance Sheet Classification |  |  |  |  |
Cash and Cash Equivalents | 0 |  | 0 |  | 0
Marketable Securities, Current | 8,466 |  | 8,466 |  | 10,003
Marketable Securities, Non- current | 180,343 |  | 180,343 |  | 158,739
Income Taxes & Other Receivables | 0 |  | 0 |  |
Other Accrued Liabilities |  |  |  |  | 0
Fair Value, Inputs, Level 1 | Cash |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Cash and cash equivalents, fair value | 735,392 |  | 735,392 |  | 874,490
Balance Sheet Classification |  |  |  |  |
Cash and Cash Equivalents | 735,392 |  | 735,392 |  | 874,490
Marketable Securities, Current | 0 |  | 0 |  | 0
Marketable Securities, Non- current | 0 |  | 0 |  | 0
Income Taxes & Other Receivables | 0 |  | 0 |  |
Other Accrued Liabilities |  |  |  |  | 0
Fair Value, Inputs, Level 1 | Money market funds |  |  |  |  |
Fair Value Measurement |  |  |  |  |
Cash and cash equivalents, fair value | 36,506 |  | 36,506 |  | 88,091
Balance Sheet Classification |  |  |  |  |
Cash and Cash Equivalents | 36,506 |  | 36,506 |  | 88,091
Marketable Securities, Current | 0 |  | 0 |  | 0
Marketable Securities, Non- current | 0 |  | 0 |  | 0
Income Taxes & Other Receivables | $ 0 |  | $ 0 |  |
Other Accrued Liabilities |  |  |  |  | $ 0

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