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Fair Value Measurements - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | $ 153,684 | $ 84,229
Total marketable securities | 679,670 | 666,115
Total cash equivalents and marketable securities | 833,354 | 750,344
Asset-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities |  | 121
Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 41,486 | 70,755
Corporate notes and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 446,763 | 225,822
Sovereign bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities |  | 7,676
U.S. government and agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 191,421 | 361,741
Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 24,405 |
Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 129,279 | 83,049
Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 153,684 | 84,229
Total marketable securities | 679,670 | 666,115
Total cash equivalents and marketable securities | 833,354 | 750,344
Liabilities: |  |
Contingent earn-out consideration liability | 11,326 | 16,813
Total contingent earn-out consideration liability | 11,326 | 16,813
Fair Value, Recurring | Asset-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities |  | 121
Fair Value, Recurring | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 41,486 | 70,755
Fair Value, Recurring | Corporate notes and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents |  | 1,180
Total marketable securities | 446,763 | 225,822
Fair Value, Recurring | Sovereign bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities |  | 7,676
Fair Value, Recurring | U.S. government and agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 191,421 | 361,741
Fair Value, Recurring | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 24,405 |
Fair Value, Recurring | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 129,279 | 83,049
Level 1 | Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 129,279 | 83,049
Total marketable securities | 188,406 | 355,804
Total cash equivalents and marketable securities | 317,685 | 438,853
Liabilities: |  |
Contingent earn-out consideration liability | 0 | 0
Total contingent earn-out consideration liability | 0 | 0
Level 1 | Fair Value, Recurring | Asset-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities |  | 0
Level 1 | Fair Value, Recurring | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 0 | 0
Level 1 | Fair Value, Recurring | Corporate notes and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents |  | 0
Total marketable securities | 0 | 0
Level 1 | Fair Value, Recurring | Sovereign bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities |  | 0
Level 1 | Fair Value, Recurring | U.S. government and agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 188,406 | 355,804
Level 1 | Fair Value, Recurring | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0 |
Level 1 | Fair Value, Recurring | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 129,279 | 83,049
Level 2 | Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 24,405 | 1,180
Total marketable securities | 491,264 | 310,311
Total cash equivalents and marketable securities | 515,669 | 311,491
Liabilities: |  |
Contingent earn-out consideration liability | 0 | 0
Total contingent earn-out consideration liability | 0 | 0
Level 2 | Fair Value, Recurring | Asset-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities |  | 121
Level 2 | Fair Value, Recurring | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 41,486 | 70,755
Level 2 | Fair Value, Recurring | Corporate notes and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents |  | 1,180
Total marketable securities | 446,763 | 225,822
Level 2 | Fair Value, Recurring | Sovereign bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities |  | 7,676
Level 2 | Fair Value, Recurring | U.S. government and agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 3,015 | 5,937
Level 2 | Fair Value, Recurring | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 24,405 |
Level 2 | Fair Value, Recurring | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0 | 0
Level 3 | Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Total cash equivalents and marketable securities | 0 | 0
Liabilities: |  |
Contingent earn-out consideration liability | 11,326 | 16,813
Total contingent earn-out consideration liability | 11,326 | 16,813
Level 3 | Fair Value, Recurring | Asset-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities |  | 0
Level 3 | Fair Value, Recurring | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 0 | 0
Level 3 | Fair Value, Recurring | Corporate notes and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents |  | 0
Total marketable securities | 0 | 0
Level 3 | Fair Value, Recurring | Sovereign bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities |  | 0
Level 3 | Fair Value, Recurring | U.S. government and agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 0 | 0
Level 3 | Fair Value, Recurring | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0 |
Level 3 | Fair Value, Recurring | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | $ 0 | $ 0

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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/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 2: 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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