CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Accumulated other comprehensive income	Accumulated deficit
Beginning balance (in shares) at Sep. 30, 2021		36,984
Shares of common stock
Stock-based compensation (in shares)		285
Stock option exercises (in shares)		6
Ending balance (in shares) at Dec. 31, 2021		37,275
Balance, beginning of period at Sep. 30, 2021		$ 782,266	$ (47,721)	$ 687	$ (597,766)
Shares of common stock
Stock-based compensation		1,088
Stock option exercises		29
Tax withholding paid on behalf of employees for stock-based awards		(54)
Translation adjustment	$ 20			20
Pension income
Net (loss) income	2,414				2,414
Balance, end of period at Dec. 31, 2021	$ 140,963	$ 783,329	(47,721)	707	(595,352)
Beginning balance (in shares) at Sep. 30, 2022	37,591	37,591
Shares of common stock
Stock-based compensation (in shares)		277
Stock option exercises (in shares)		0
Ending balance (in shares) at Dec. 31, 2022	37,868	37,868
Balance, beginning of period at Sep. 30, 2022		$ 787,347	(47,721)	1,301	(622,099)
Shares of common stock
Stock-based compensation		1,734
Stock option exercises		0
Tax withholding paid on behalf of employees for stock-based awards		(1)
Translation adjustment	$ 47			(47)
Pension income
Net (loss) income	(11,693)				(11,693)
Balance, end of period at Dec. 31, 2022	$ 108,821	$ 789,080	$ (47,721)	$ 1,254	$ (633,792)