Supplemental Balance Sheet Information - Summary of Other Noncurrent Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Schedule Of Investments [Line Items]
Other assets	$ 4,756	$ 4,769
Operating Lease Right-of-Use Assets [Member]
Schedule Of Investments [Line Items]
Other assets	3,319	3,633
Other [Member]
Schedule Of Investments [Line Items]
Other assets	$ 1,437	$ 1,136