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	Jul. 31, 2024	Apr. 30, 2024
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
AFS Debt Maturities, Within one year, Amortized Cost	$ 534,132	$ 514,747
AFS Debt Maturities, After one year through five years, Amortized Cost	94,213	69,034
Amortized Cost	628,345	583,781
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
AFS Debt Maturities, Within one year, Fair Value	534,185	514,484
AFS Debt Maturities, After one year through five years, Fair Value	94,530	68,736
AFS Debt Maturities, Total Fair Value	$ 628,715	$ 583,220