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Fair Value Measurement - Summary of Company's Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Assets    
Total financial assets $ 442,472 $ 269,748
Liabilities    
Total financial liabilities 9,856  
Commercial Paper [Member]    
Assets    
Total financial assets   94,840
US Government Treasury Bills [Member]    
Assets    
Total financial assets 12,034 101,495
Contingent consideration and indemnity holdback    
Liabilities    
Total financial liabilities 9,856  
Fair Value, Inputs, Level 1 [Member]    
Assets    
Total financial assets 442,472 174,908
Fair Value, Inputs, Level 1 [Member] | US Government Treasury Bills [Member]    
Assets    
Total financial assets 12,034 101,495
Fair Value, Inputs, Level 2 [Member]    
Assets    
Total financial assets   94,840
Liabilities    
Total financial liabilities 9,856  
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]    
Assets    
Total financial assets   94,840
Fair Value, Inputs, Level 2 [Member] | Contingent consideration and indemnity holdback    
Liabilities    
Total financial liabilities 9,856  
Money Market Funds [Member]    
Assets    
Total financial assets 430,438 73,413
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets    
Total financial assets $ 430,438 $ 73,413