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Fair Value Measurements - Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Mar. 31, 2023
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities $ 631,436  
Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 81,827  
Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 621,451 $ 682,972
Commercial paper | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 9,985  
Asset-backed securities | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 6,662 7,200
Certificates of deposit | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 11,951 27,300
Commercial paper | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 99,736 78,489
Corporate notes and bonds | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 66,086 118,512
Sovereign bonds | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 7,477 7,384
U.S. government and agency securities | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 429,539 444,087
Fair Value, Recurring    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 703,278 809,247
Liabilities:    
Contingent earn-out consideration liability 16,178 21,862
Total contingent earn-out consideration liability 16,178 21,862
Fair Value, Recurring | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 81,827 126,275
Fair Value, Recurring | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 621,451 682,972
Fair Value, Recurring | Commercial paper | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 9,985  
Fair Value, Recurring | Money market funds | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 71,842 126,275
Fair Value, Recurring | Asset-backed securities | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 6,662 7,200
Fair Value, Recurring | Certificates of deposit | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 11,951 27,300
Fair Value, Recurring | Commercial paper | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 99,736 78,489
Fair Value, Recurring | Corporate notes and bonds | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 66,086 118,512
Fair Value, Recurring | Sovereign bonds | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 7,477 7,384
Fair Value, Recurring | U.S. government and agency securities | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 429,539 444,087
Level 1 | Fair Value, Recurring    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 487,122 566,023
Liabilities:    
Contingent earn-out consideration liability 0 0
Total contingent earn-out consideration liability 0 0
Level 1 | Fair Value, Recurring | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 71,842 126,275
Level 1 | Fair Value, Recurring | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 415,280 439,748
Level 1 | Fair Value, Recurring | Commercial paper | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0  
Level 1 | Fair Value, Recurring | Money market funds | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 71,842 126,275
Level 1 | Fair Value, Recurring | Asset-backed securities | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 1 | Fair Value, Recurring | Certificates of deposit | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 1 | Fair Value, Recurring | Commercial paper | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 1 | Fair Value, Recurring | Corporate notes and bonds | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 1 | Fair Value, Recurring | Sovereign bonds | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 1 | Fair Value, Recurring | U.S. government and agency securities | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 415,280 439,748
Level 2 | Fair Value, Recurring    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 216,156 243,224
Liabilities:    
Contingent earn-out consideration liability 0 0
Total contingent earn-out consideration liability 0 0
Level 2 | Fair Value, Recurring | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 9,985 0
Level 2 | Fair Value, Recurring | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 206,171 243,224
Level 2 | Fair Value, Recurring | Commercial paper | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 9,985  
Level 2 | Fair Value, Recurring | Money market funds | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 2 | Fair Value, Recurring | Asset-backed securities | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 6,662 7,200
Level 2 | Fair Value, Recurring | Certificates of deposit | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 11,951 27,300
Level 2 | Fair Value, Recurring | Commercial paper | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 99,736 78,489
Level 2 | Fair Value, Recurring | Corporate notes and bonds | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 66,086 118,512
Level 2 | Fair Value, Recurring | Sovereign bonds | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 7,477 7,384
Level 2 | Fair Value, Recurring | U.S. government and agency securities | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 14,259 4,339
Level 3 | Fair Value, Recurring    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Liabilities:    
Contingent earn-out consideration liability 16,178 21,862
Total contingent earn-out consideration liability 16,178 21,862
Level 3 | Fair Value, Recurring | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 3 | Fair Value, Recurring | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 3 | Fair Value, Recurring | Commercial paper | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0  
Level 3 | Fair Value, Recurring | Money market funds | Cash and Cash Equivalents    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 3 | Fair Value, Recurring | Asset-backed securities | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 3 | Fair Value, Recurring | Certificates of deposit | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 3 | Fair Value, Recurring | Commercial paper | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 3 | Fair Value, Recurring | Corporate notes and bonds | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 3 | Fair Value, Recurring | Sovereign bonds | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities 0 0
Level 3 | Fair Value, Recurring | U.S. government and agency securities | Marketable Securities    
Assets, Fair Value Disclosure [Abstract]    
Cash equivalents and marketable securities $ 0 $ 0