Supplemental Balance Sheet Information - Schedule of Other Long-term Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Other Liabilities Disclosure [Abstract]
Deferred consideration	$ 4,212	$ 5,106
Contingent consideration	823	817
Unrecognized tax benefits	2,422	2,538
Operating lease liabilities	4,303	3,188
Other long-term liabilities	$ 11,760	$ 11,649