Reportable Segments - Schedule of Reportable Segment Information (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
		Mar. 31, 2025	Jun. 30, 2025	Sep. 30, 2025		Sep. 30, 2024
Segment Reporting Information [Line Items]
Net revenues				$ 79,364		$ 101,214
Intangible asset impairment						849
Gross profit				26,983		36,231
Loss on sale of fixed assets				248		(2,197)
Goodwill impairment		$ 20,400		20,353		6,370
Intangible asset impairment				2,569		430
Severance expense				701		350
Operating income (loss)				(28,488)		(6,729)
Interest income				239		57
Interest expense				(26)		(557)
Other segment items				(1,136)	[1]	(900)	[2]
Non-segment items				(9,429)	[3]	(8,909)	[4]
Net Loss				(30,326)		(8,486)
Depreciation and amortization				2,742		3,029
Identifiable assets				92,873		119,313
Thermal Processing Solutions
Segment Reporting Information [Line Items]
Goodwill impairment			$ 5,000	4,997
Other segment items				(1,127)	[1]	(1,081)	[2]
Net Loss				(646)		5,117
Semiconductor Fabrication Solutions
Segment Reporting Information [Line Items]
Goodwill impairment			$ 15,400	15,356
Other segment items				(9)	[1]	181	[2]
Net Loss				(20,251)		(4,694)
Operating Segments
Segment Reporting Information [Line Items]
Net revenues				79,364		101,214
Material				37,313		45,067
Labor				8,027		11,524
Overhead				7,041		7,543
Intangible asset impairment						849
Gross profit				26,983		36,231
Selling & marketing				8,549		10,899
General & administrative				11,839		12,709
Research & development				2,649		4,193
Loss on sale of fixed assets				248
Goodwill impairment				20,353		6,370
Intangible asset impairment				2,569		430
Severance expense				636		309
Operating income (loss)				(19,860)		1,321
Interest income				125		13
Interest expense				(26)		(11)
Operating Segments | Thermal Processing Solutions
Segment Reporting Information [Line Items]
Net revenues				58,057		69,161
Material				27,711		33,045
Labor				4,837		7,086
Overhead				4,943		4,761
Gross profit				20,566		24,269
Selling & marketing				7,658		9,290
General & administrative				4,771		5,820
Research & development				2,133		2,840
Loss on sale of fixed assets				(174)
Goodwill impairment				4,997
Severance expense				412		123
Operating income (loss)				421		6,196
Interest income				82		13
Interest expense				(22)		(11)
Depreciation and amortization				1,031		788
Identifiable assets				56,019		68,051
Operating Segments | Semiconductor Fabrication Solutions
Segment Reporting Information [Line Items]
Net revenues				21,307		32,053
Material				9,602		12,022
Labor				3,190		4,438
Overhead				2,098		2,782
Intangible asset impairment						849
Gross profit				6,417		11,962
Selling & marketing				891		1,609
General & administrative				7,068		6,889
Research & development				516		1,353
Loss on sale of fixed assets				(74)
Goodwill impairment				15,356		6,370
Intangible asset impairment				2,569		430
Severance expense				224		186
Operating income (loss)				(20,281)		(4,875)
Interest income				43
Interest expense				(4)
Depreciation and amortization				1,620		2,154
Identifiable assets				26,040		46,915
Non-Segment Related
Segment Reporting Information [Line Items]
Depreciation and amortization	[5]			91		87
Identifiable assets	[6]			$ 10,814		$ 4,347

[1] Other segment items consists primarily of expenses related to foreign currency gain or loss and income tax provision (benefit). Thermal Processing Solutions and Semiconductor Fabricated Solutions income tax provision was $1.4 million and $13,000.

[2] Other segment items consists primarily of expenses related to foreign currency gain or loss and income tax provision (benefit). Thermal Processing Solutions and Semiconductor Fabricated Solutions income tax provision (benefit) was $0.8 million and ($0.2) million, respectively.

[3] Non-segment items consists primarily of expenses related to corporate salaries and professional services expenses, income tax, interest income and interest expense.

[4] Non-segment items consists primarily of expenses related to corporate salaries and professional services expenses, gain on sale of assets, income tax, interest income and interest expense.

[5] Non-segment related to depreciation and amortization expense at corporate.

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