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, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax (benefit) expense at the federal statutory rate	$ (1,577)	$ (3,188)	$ 3,945
Effect of permanent book-tax differences	152	757	11
State tax provision	18	(395)	554
Valuation allowance for net deferred tax assets	1,179	1,594	(3,138)
Uncertain tax items		(1,004)	55
Tax rate differential	580	358	535
Goodwill impairment	1,334
Other items	(711)	(722)	(544)
Total provision (benefit)	$ 975	$ (2,600)	$ 1,418
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	(2.00%)	(5.00%)	0.10%
State tax provision	(0.30%)	2.60%	2.90%
Valuation allowance for net deferred tax assets	(15.70%)	(10.50%)	(16.70%)
Uncertain tax items	0.00%	6.60%	0.30%
Tax rate differential	(7.70%)	(2.40%)	2.80%
Goodwill impairment	(17.80%)	0.00%	0.00%
Other items	9.50%	4.80%	(2.90%)
Total (benefit) provision	(13.00%)	17.10%	7.50%