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
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