Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)
Goodwill [Line Items]
Beginning balance	$ 27,631
Impairment of goodwill	(6,370)
Goodwill	27,631	$ 27,631
Accumulated impairment losses	(6,370)
Ending balance	21,261
Semiconductor
Goodwill [Line Items]
Beginning balance	5,905
Goodwill	5,905	5,905
Ending balance	5,905
Material and Substrate
Goodwill [Line Items]
Beginning balance	21,726
Impairment of goodwill	(6,370)
Goodwill	21,726	$ 21,726
Accumulated impairment losses	(6,370)
Ending balance	$ 15,356