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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 50,949	$ (3,774)	$ (19,260)
Other comprehensive (loss) income:
Defined benefit pension plan—unrecognized amounts, net of taxes	170	(2,293)	(540)
Foreign currency translation, net of taxes	601	484	(984)
Other comprehensive income (loss), net of taxes	771	(1,809)	(1,524)
Comprehensive income (loss)	$ 51,720	$ (5,583)	$ (20,784)

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