Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Mar. 31, 2025	Jun. 30, 2025	Sep. 30, 2025	Sep. 30, 2024
Goodwill [Line Items]
Beginning balance			$ 21,261
Impairment of goodwill	$ (20,400)		(20,353)	$ (6,370)
Goodwill			21,261	27,631
Accumulated impairment losses			(20,353)	(6,370)
Ending Balance			908	21,261
Thermal Processing Solutions
Goodwill [Line Items]
Beginning balance			5,905
Impairment of goodwill		$ (5,000)	(4,997)
Goodwill			5,905	5,905
Accumulated impairment losses			(4,997)
Ending Balance			908	5,905
Semiconductor Fabrication Solutions
Goodwill [Line Items]
Beginning balance			15,356
Impairment of goodwill		$ (15,400)	(15,356)
Goodwill			15,356	21,726
Accumulated impairment losses			$ (15,356)	(6,370)
Ending Balance				$ 15,356