Goodwill and Intangible Assets - Amortization Expense Associated with Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 532	$ 810	$ 1,619	$ 2,692
Completed Technology
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	125	257	375	902
Customer Contracts
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	407	510	1,244	1,659
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 0	$ 43	$ 0	$ 131