Income Taxes - Schedule of Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Provision for income taxes attributable to continuing operations
Income tax expense (benefit) at the federal statutory rate	$ 30,833	$ 24,278	$ 10,843
State taxes, net of federal benefit	2,857	3,421	1,814
Mexico inflation adjustment	(1,518)	(2,154)	(1,787)
Non-deductible items	3,694	4,169	2,655
Foreign rate differential	2,081	2,098	2,381
Change in valuation allowance	(365)	(411)	311
Stock compensation	(527)	(202)	(62)
Uncertain tax positions	259	(198)	(174)
Foreign withholding tax	0	998	0
Deferred tax true-up	0	587	(165)
Dividends received deduction	(2,614)	(742)	(754)
Non-deductible loss on debt restructuring	0	0	1,710
U.S. GAAP/statutory book adjustments	760	(239)	(1,143)
Other	1,700	908	(2,459)
Total income tax expense	$ 37,160	$ 32,513	$ 13,170
Effective tax rate	25.00%	28.00%	26.00%