Other Assets - Other Noncurrent Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Notes receivable	$ 1,622	$ 2,124
Other assets	162	160
Total other assets	$ 1,784	$ 2,284