CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 13,737	$ 631	$ 16,660
Foreign currency translation adjustments	(8,689)	4,253	60
Loss on cash flow commodity hedge	(325)	0	0
Postretirement benefit adjustment, net of tax	372	(96)	(26)
Comprehensive income	$ 5,095	$ 4,788	$ 16,694