Goodwill and Intangible Assets - Amortization Expense Associated with Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 543	$ 945	$ 1,087	$ 1,882
Completed Technology
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	125	323	250	645
Customer Contracts
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	418	578	837	1,149
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 0	$ 44	$ 0	$ 88