CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND NONCONTROLLING INTEREST - USD ($) $ in Thousands	Total	Common Shares	Additional paid-in capital	Accumulated deficit	Accumulated Other Comprehensive Income	Non- Controlling Interests
Beginning balance (in shares) at Sep. 30, 2022		25,598,289
Beginning balance at Sep. 30, 2022	$ 359,766	$ 6,362	$ 707,787	$ (348,277)	$ (5,500)	$ (606)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to common shareholders	(87,323)			(86,932)		(391)
Issuance of stock under employee stock plans (in shares)		8,347
Issuance of stock under employee stock plans	24	$ 1	23
Stock-based compensation	2,046		2,046
Pension cost amortization	(54)				(54)
Foreign currency translation adjustment	5,348				5,348
Ending balance (in shares) at Dec. 31, 2022		25,606,636
Ending balance at Dec. 31, 2022	$ 279,807	$ 6,363	709,856	(435,209)	(206)	(997)
Beginning balance (in shares) at Sep. 30, 2023	25,777,169	25,777,169
Beginning balance at Sep. 30, 2023	$ 268,490	$ 6,406	715,696	(453,278)	330	(664)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to common shareholders	(15,388)			(15,828)		440
Change in noncontrolling interest	(2,085)		(2,309)			224
Issuance of stock under employee stock plans (in shares)		13,511
Issuance of stock under employee stock plans	1	$ 3	(2)
Stock-based compensation	1,897		1,897
Pension cost amortization	46				46
Foreign currency translation adjustment	$ 1,201				1,201
Ending balance (in shares) at Dec. 31, 2023	25,790,680	25,790,680
Ending balance at Dec. 31, 2023	$ 254,162	$ 6,409	$ 715,282	$ (469,106)	$ 1,577	$ 0