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 (Loss)	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]
Consolidated net (loss) income	(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, 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]
Consolidated net (loss) income	(97,317)
Pension cost amortization	(108)
Ending balance (in shares) at Mar. 31, 2023		25,759,107
Ending balance at Mar. 31, 2023	272,635	$ 6,491	711,591	(444,838)	702	(1,311)
Beginning balance (in shares) at Dec. 31, 2022		25,606,636
Beginning balance at Dec. 31, 2022	279,807	$ 6,363	709,856	(435,209)	(206)	(997)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net (loss) income	(9,994)			(9,629)		(365)
Issuance of stock under employee stock plans (in shares)		152,471
Issuance of stock under employee stock plans	82	$ 128	(46)
Stock-based compensation	1,781		1,781
Pension cost amortization	(54)				(54)
Foreign currency translation adjustment	962				962	0
Other	51					51
Ending balance (in shares) at Mar. 31, 2023		25,759,107
Ending balance at Mar. 31, 2023	$ 272,635	$ 6,491	711,591	(444,838)	702	(1,311)
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]
Consolidated net (loss) income	(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
Ending balance at Dec. 31, 2023	$ 254,162	$ 6,409	715,282	(469,106)	1,577	0
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]
Consolidated net (loss) income	(63,467)
Pension cost amortization	$ 93
Ending balance (in shares) at Mar. 31, 2024	25,905,395	25,905,395
Ending balance at Mar. 31, 2024	$ 207,162	$ 6,438	717,139	(517,185)	770	0
Beginning balance (in shares) at Dec. 31, 2023		25,790,680
Beginning balance at Dec. 31, 2023	254,162	$ 6,409	715,282	(469,106)	1,577	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net (loss) income	(48,079)			(48,079)
Issuance of stock under employee stock plans (in shares)		114,715
Issuance of stock under employee stock plans	2	$ 29	(27)
Stock-based compensation	1,884		1,884
Pension cost amortization	47				47
Foreign currency translation adjustment	$ (854)				(854)
Ending balance (in shares) at Mar. 31, 2024	25,905,395	25,905,395
Ending balance at Mar. 31, 2024	$ 207,162	$ 6,438	$ 717,139	$ (517,185)	$ 770	$ 0