Inventories - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Inventory [Line Items]
Write-down of inventory	$ 2,620	$ 102	$ 544
Materials and Substrate
Inventory [Line Items]
Write-down of inventory	$ 1,500