Income Taxes - Schedule of Reconciliation of Actual Income Taxes to Income Taxes at Expected U.S. Federal Corporate Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax (benefit) expense at the federal statutory rate	$ (3,188)	$ 3,945	$ 722
Effect of permanent book-tax differences	757	11	54
State tax provision	(395)	554	24
Valuation allowance for net deferred tax assets	1,594	(3,138)	842
Uncertain tax items	(1,004)	55	(276)
Tax rate differential	358	535	267
Other items	(722)	(544)	293
Total (benefit) provision	$ (2,600)	$ 1,418	$ 1,926
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Tax (benefit) expense at the federal statutory rate	21.00%	21.00%	21.00%
Effect of permanent book-tax differences	(5.00%)	0.10%	1.60%
State tax provision	2.60%	2.90%	0.70%
Valuation allowance for net deferred tax assets	(10.50%)	(16.70%)	24.50%
Uncertain tax items	6.60%	0.30%	(8.00%)
Tax rate differential	(2.40%)	2.80%	7.80%
Other items	4.80%	(2.90%)	8.40%
Total (benefit) provision	17.10%	7.50%	56.00%