Reportable Segments - Schedule of Reportable Segment Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net revenues		$ 101,214	$ 113,315	$ 106,298
Operating income (loss)		(6,729)	(14,970)	17,286
Depreciation and amortization		3,029	5,012	1,729
Identifiable assets		118,953	137,021
Continuing Operations
Segment Reporting Information [Line Items]
Capital expenditures		3,029	5,012	1,729
Depreciation and amortization		4,878	2,898	1,135
Operating Segments | Thermal Processing Solutions
Segment Reporting Information [Line Items]
Net revenues		69,161	77,595	87,982
Operating income (loss)		6,196	6,907	20,672
Identifiable assets		68,051	72,466
Operating Segments | Thermal Processing Solutions | Continuing Operations
Segment Reporting Information [Line Items]
Capital expenditures		3,431	345	452
Depreciation and amortization		788	886	1,101
Operating Segments | Semiconductor Fabrication Solutions
Segment Reporting Information [Line Items]
Net revenues		32,053	35,720	18,316
Operating income (loss)		(4,875)	(8,765)	3,728
Identifiable assets		46,915	61,576
Operating Segments | Semiconductor Fabrication Solutions | Continuing Operations
Segment Reporting Information [Line Items]
Capital expenditures		1,276	1,092	411
Depreciation and amortization		2,154	4,045	565
Non-Segment Related
Segment Reporting Information [Line Items]
Operating income (loss)		(8,050)	(13,112)	(7,114)
Identifiable assets	[1]	3,987	2,979
Non-Segment Related | Continuing Operations
Segment Reporting Information [Line Items]
Capital expenditures		171	1,461	272
Depreciation and amortization		$ 87	$ 81	$ 63

[1] Non-segment related assets include cash, property and other assets.