Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (743)	$ 9,191
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax $0 and $0, respectively	(102)	410
Retirement plan liability adjustment, net of tax $0 and $0, respectively	4,491	(569)
Comprehensive income	$ 3,646	$ 9,032