Fair Value Measurement - Summary of Company's Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Assets
Cash and cash equivalents, fair value	$ 307,459	$ 378,687
Equity investments	3,711
Total financial assets	295,504	443,086
Liabilities
Total financial liabilities		11,692
U.S. government treasury bills
Assets
Short term investments, fair value	23,616	111,284
Corporate bonds
Assets
Cash and cash equivalents, fair value	26,070
Short term investments, fair value	26,070
Commercial paper
Assets
Cash and cash equivalents, fair value		14,997
Short term investments, fair value		14,997
Money market funds
Assets
Cash and cash equivalents, fair value	242,107	316,805
Contingent consideration and holdbacks
Liabilities
Total financial liabilities		11,692
Level 1
Assets
Equity investments	0
Total financial assets	265,723	428,089
Liabilities
Total financial liabilities		0
Level 1 | U.S. government treasury bills
Assets
Short term investments, fair value	23,616	111,284
Level 1 | Corporate bonds
Assets
Cash and cash equivalents, fair value	0
Level 1 | Commercial paper
Assets
Cash and cash equivalents, fair value		0
Level 1 | Money market funds
Assets
Cash and cash equivalents, fair value	242,107	316,805
Level 1 | Contingent consideration and holdbacks
Liabilities
Total financial liabilities		0
Level 2
Assets
Equity investments	0
Total financial assets	26,070	14,997
Liabilities
Total financial liabilities		9,592
Level 2 | U.S. government treasury bills
Assets
Short term investments, fair value	0	0
Level 2 | Corporate bonds
Assets
Cash and cash equivalents, fair value	26,070
Level 2 | Commercial paper
Assets
Cash and cash equivalents, fair value		14,997
Level 2 | Money market funds
Assets
Cash and cash equivalents, fair value	0	0
Level 2 | Contingent consideration and holdbacks
Liabilities
Total financial liabilities		9,592
Level 3
Assets
Equity investments	3,711
Total financial assets	3,711	0
Liabilities
Total financial liabilities		2,100
Level 3 | U.S. government treasury bills
Assets
Short term investments, fair value	0	0
Level 3 | Corporate bonds
Assets
Cash and cash equivalents, fair value	0
Level 3 | Commercial paper
Assets
Cash and cash equivalents, fair value		0
Level 3 | Money market funds
Assets
Cash and cash equivalents, fair value	$ 0	0
Level 3 | Contingent consideration and holdbacks
Liabilities
Total financial liabilities		$ 2,100