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Fair Value Measurements - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Mar. 31, 2024
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | $ 138,922 | $ 84,229
Total marketable securities | 621,310 | 666,115
Total cash equivalents and marketable securities | 760,232 | 750,344
Asset-backed securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities |  | 121
Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 49,698 | 70,755
Corporate notes and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total marketable securities | 463,733 | 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 | 107,879 | 361,741
Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 14,950 |
Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 123,972 | 83,049
Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 138,922 | 84,229
Total marketable securities | 621,310 | 666,115
Total cash equivalents and marketable securities | 760,232 | 750,344
Liabilities: |  |
Contingent earn-out consideration liability | 11,236 | 16,813
Total contingent earn-out consideration liability | 11,236 | 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 | 49,698 | 70,755
Fair Value, Recurring | Corporate notes and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents |  | 1,180
Total marketable securities | 463,733 | 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 | 107,879 | 361,741
Fair Value, Recurring | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 14,950 |
Fair Value, Recurring | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 123,972 | 83,049
Level 1 | Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 123,972 | 83,049
Total marketable securities | 104,844 | 355,804
Total cash equivalents and marketable securities | 228,816 | 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 | 104,844 | 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 | 123,972 | 83,049
Level 2 | Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 14,950 | 1,180
Total marketable securities | 516,466 | 310,311
Total cash equivalents and marketable securities | 531,416 | 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 | 49,698 | 70,755
Level 2 | Fair Value, Recurring | Corporate notes and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents |  | 1,180
Total marketable securities | 463,733 | 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 | 3,035 | 5,937
Level 2 | Fair Value, Recurring | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 14,950 |
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 | 11,236 | 16,813
Total contingent earn-out consideration liability | 11,236 | 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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