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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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