CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 54,525	$ 13,737	$ 631
Foreign currency translation adjustments	1,915	(8,689)	4,253
Gain (loss) on cash flow commodity hedge	325	(325)	0
Postretirement benefit adjustment, net of tax	(151)	372	(96)
Comprehensive income	$ 56,614	$ 5,095	$ 4,788