Cash Equivalents and Marketable Securities - Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Oct. 31, 2025	Apr. 30, 2025	Oct. 31, 2024
Cash equivalents:
Amortized Cost	$ 103,205	$ 164,358	$ 121,274
Debt Securities, Available-for-Sale [Abstract]
Total cash equivalents and available-for-sale marketable securities, Amortized Cost	646,567	695,816
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain	819	663
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss	(34)	(140)
Total cash equivalents and available-for-sale marketable securities	647,352	696,339
Money market funds
Cash equivalents:
Amortized Cost	60,064	87,872
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	60,064	87,872
Commercial paper
Cash equivalents:
Amortized Cost	15,220	29,122
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	15,220	29,122
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	116,181	113,787
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	116,181	113,787
Corporate debt securities
Cash equivalents:
Amortized Cost	239	1,015
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	239	1,015
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	296,573	315,034
Gross Unrealized Gains	641	502
Gross Unrealized Losses	(24)	(131)
Estimated Fair Value	297,190	315,405
U.S. treasury securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	14,808	15,478
Gross Unrealized Gains	9	4
Gross Unrealized Losses	0	0
Estimated Fair Value	14,817	15,482
Certificates of deposit
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	71,691	76,518
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	71,691	76,518
U.S. government agencies securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	71,791	56,990
Gross Unrealized Gains	169	157
Gross Unrealized Losses	(10)	(9)
Estimated Fair Value	$ 71,950	$ 57,138

Cash And Cash Equivalents Accumulated Gross Unrealized Gain Before Tax

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Cash And Cash Equivalents, Accumulated Gross Unrealized Loss, Before Tax

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

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Fair value portion of asset recognized for present right to economic benefit.

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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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