Cash Equivalents and Marketable Securities - Cash Equivalents and Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2024
Cash equivalents:
Amortized Cost	$ 66,197	$ 164,358	$ 167,146
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities, Amortized Cost	562,015	695,816
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain	244	663
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss	(292)	(140)
Total cash equivalents and available-for-sale marketable securities	561,967	696,339
Money market funds
Cash equivalents:
Estimated Fair Value	52,715	87,872
Commercial paper
Cash equivalents:
Estimated Fair Value	0	29,122
Available-for-sale marketable securities:
Amortized Cost	103,824	113,787
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	103,824	113,787
Corporate debt securities
Cash equivalents:
Estimated Fair Value	0	1,015
Available-for-sale marketable securities:
Amortized Cost	243,643	315,034
Gross Unrealized Gains	194	502
Gross Unrealized Losses	(212)	(131)
Estimated Fair Value	243,625	315,405
U.S. treasury securities
Available-for-sale marketable securities:
Amortized Cost	0	15,478
Gross Unrealized Gains	0	4
Gross Unrealized Losses	0	0
Estimated Fair Value	0	15,482
Certificates of deposit
Available-for-sale marketable securities:
Amortized Cost	92,112	76,518
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	92,112	76,518
U.S. government agencies securities
Available-for-sale marketable securities:
Amortized Cost	69,721	56,990
Gross Unrealized Gains	50	157
Gross Unrealized Losses	(80)	(9)
Estimated Fair Value	69,691	57,138
Money market funds
Cash equivalents:
Amortized Cost	52,715	87,872
Estimated Fair Value	52,715	87,872
Commercial paper
Cash equivalents:
Amortized Cost	0	29,122
Estimated Fair Value	0	29,122
Corporate debt securities
Cash equivalents:
Amortized Cost	0	1,015
Estimated Fair Value	$ 0	$ 1,015

Cash, Cash Equivalents And Available-for-sale Debt Securities

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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