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Cash Equivalents and Marketable Securities - Available-for Sale Debt Securities by Contractual Maturity (Details) - Debt Securities, Available-For-Sale, Excluding Money Market Accounts - USD ($) $ in Thousands | Oct. 31, 2024 | Apr. 30, 2024
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Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] |  |
AFS debt maturities, within one year, amortized cost | $ 482,694 | $ 514,747
AFS debt maturities, after one year through five years, amortized cost | 125,883 | 69,034
Amortized Cost | 608,577 | 583,781
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
AFS debt maturities, within one year, fair value | 483,395 | 514,484
AFS debt maturities, after one year through five years, fair value | 125,705 | 68,736
AFS debt maturities, total fair value | $ 609,100 | $ 583,220

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