Commitments and Contingencies - Operating leases and purchase obligations (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Purchase Obligations
Purchase obligations on open purchase orders	$ 2,400,000	$ 2,600,000	$ 2,100,000
Product Liability
Product liability insurance	$ 50,000,000