Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Provision for income taxes attributable to continuing operations
Income tax expense (benefit) at the federal statutory rate	$ 10,843	$ 14,223	$ 3,374
State taxes, net of federal benefit	1,814	1,728	931
Mexico inflation adjustment	(1,787)	(2,089)	(1,217)
Non-deductible items	2,655	1,705	2,087
Foreign rate differential	2,381	1,306	1,111
Change in valuation allowance	311	660	(137)
Stock compensation	(62)	(161)	293
Uncertain tax positions	(174)	(2,025)	208
Deferred tax true-up	(165)	3,811	896
Dividends received deduction	(754)	(699)	0
Non-deductible loss on debt restructuring	1,710	0	0
U.S. GAAP/statutory book adjustments	(1,143)	0	0
Other	(2,459)	(906)	(96)
Total income tax expense	$ 13,170	$ 17,553	$ 7,450
Effective tax rate	26.00%	26.00%	46.00%