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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 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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