Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Provision for income taxes attributable to continuing operations
Income tax expense (benefit) at the federal statutory rate	$ 14,223	$ 3,374	$ (14,720)
State taxes, net of federal benefit	1,728	931	951
Mexico inflation adjustment	(2,089)	(1,217)	(1,120)
Non-deductible items	1,705	2,087	772
Foreign rate differential	1,306	1,111	(1,671)
Change in valuation allowance	660	(137)	962
Stock compensation	(161)	293	598
Uncertain tax positions	(2,025)	208	2,849
Non-deductible impairment	0	0	9,093
Deferred tax true-up	3,811	896	0
Other	(1,605)	(96)	654
Total income tax expense (benefit)	$ 17,553	$ 7,450	$ (1,632)
Effective tax rate	26.00%	46.00%	2.00%