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Cash Equivalents and Marketable Securities - Available-for-Sale Marketable Securities, Fair Value and Unrealized Losses Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Oct. 31, 2024 | Apr. 30, 2024
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
AFS, Less Than 12 Months, Unrealized Losses | $ (438) | $ (590)
AFS, Less Than 12 Months, Fair Value | 72,783 | 237,352
AFS, 12 Months or Greater, Unrealized Losses | 0 | (40)
AFS, 12 Months or Greater, Fair Value | 2,000 | 35,407
AFS, Total Unrealized Losses | (438) | (630)
AFS, Total Fair Value | 74,783 | 272,759
U.S. treasury securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
AFS, Less Than 12 Months, Unrealized Losses | (1) | 0
AFS, Less Than 12 Months, Fair Value | 3,192 | 2,497
AFS, 12 Months or Greater, Unrealized Losses | 0 | 0
AFS, 12 Months or Greater, Fair Value | 0 | 0
AFS, Total Unrealized Losses | (1) | 0
AFS, Total Fair Value | 3,192 | 2,497
U.S. government agencies securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
AFS, Less Than 12 Months, Unrealized Losses | (151) | (99)
AFS, Less Than 12 Months, Fair Value | 18,790 | 33,890
AFS, 12 Months or Greater, Unrealized Losses | 0 | (6)
AFS, 12 Months or Greater, Fair Value | 0 | 7,749
AFS, Total Unrealized Losses | (151) | (105)
AFS, Total Fair Value | 18,790 | 41,639
Commercial paper |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
AFS, Less Than 12 Months, Unrealized Losses | 0 | 0
AFS, Less Than 12 Months, Fair Value | 3,472 | 4,058
AFS, 12 Months or Greater, Unrealized Losses | 0 | 0
AFS, 12 Months or Greater, Fair Value | 0 | 0
AFS, Total Unrealized Losses | 0 | 0
AFS, Total Fair Value | 3,472 | 4,058
Corporate debt securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
AFS, Less Than 12 Months, Unrealized Losses | (286) | (491)
AFS, Less Than 12 Months, Fair Value | 47,329 | 196,907
AFS, 12 Months or Greater, Unrealized Losses | 0 | (34)
AFS, 12 Months or Greater, Fair Value | 2,000 | 27,658
AFS, Total Unrealized Losses | (286) | (525)
AFS, Total Fair Value | $ 49,329 | $ 224,565

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