Summary of Significant Accounting Policies - Activity Related to Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Accounting Policies [Abstract]
Beginning Balance		$ 1,394	$ 865
Bad debt provisions	$ (413)	$ (415)	704
Write-offs, net of recoveries			(175)
Ending Balance			$ 1,394