Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2025	Dec. 31, 2023	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024
Goodwill [Line Items]
Beginning balance			$ 21,261,000
Goodwill acquired			0
Impairment of goodwill	$ (20,353,000)		(20,353,000)	$ (6,370,000)	$ (6,400,000)
Goodwill	21,261,000		21,261,000		27,631,000
Accumulated impairment losses	(20,353,000)		(20,353,000)		(6,370,000)
Ending balance	908,000		908,000		21,261,000
Thermal Processing Solutions
Goodwill [Line Items]
Beginning balance			5,905,000
Goodwill acquired			0
Impairment of goodwill	(5,000,000)	$ 0	(4,997,000)
Goodwill	5,905,000		5,905,000		5,905,000
Accumulated impairment losses	(4,997,000)		(4,997,000)		0
Ending balance	908,000		908,000		5,905,000
Semiconductor Fabrication Solutions
Goodwill [Line Items]
Beginning balance			15,356,000
Goodwill acquired			0
Impairment of goodwill	(15,400,000)	$ (6,400,000)	(15,356,000)
Goodwill	15,356,000		15,356,000		21,726,000
Accumulated impairment losses	(15,356,000)		(15,356,000)		(6,370,000)
Ending balance	$ 0		$ 0		$ 15,356,000