Supplemental Balance Sheet Information - Summary of Other Noncurrent Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Schedule Of Investments [Line Items]
Other assets	$ 5,487	$ 3,718
Operating Lease Right-of-Use Assets [Member]
Schedule Of Investments [Line Items]
Other assets	3,846	2,435
Other [Member]
Schedule Of Investments [Line Items]
Other assets	$ 1,641	$ 1,283