Summary of Significant Accounting Policies and Select Balance Sheet Information - Summary of Other Noncurrent Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Schedule of Investments [Line Items]
Other assets, net	$ 4,769	$ 3,718
Operating Lease Right-of-Use Assets [Member]
Schedule of Investments [Line Items]
Other assets, net	3,633	2,435
Other [Member]
Schedule of Investments [Line Items]
Other assets, net	$ 1,136	$ 1,283