Cash Equivalents and Marketable Securities - Available-for Sale Marketable Securities by Contractual Maturity (Details) - Debt Securities, Available-For-Sale, Excluding Money Market Accounts - USD ($) $ in Thousands	Apr. 30, 2025	Apr. 30, 2024
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
AFS Marketable Securities Maturities, Within one year, Amortized Cost	$ 455,613	$ 514,747
AFS Marketable Securities Maturities, After one year through five years, Amortized Cost	122,194	69,034
Amortized Cost	577,807	583,781
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
AFS Marketable Securities Maturities, Within one year, Fair Value	455,956	514,485
AFS Marketable Securities Maturities, After one year through five years, Fair Value	122,374	68,736
AFS Marketable Securities Maturities, Total Fair Value	$ 578,330	$ 583,221