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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
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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

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