Leases - Assets and Liabilities - Finance Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Finance Lease, Right-of-Use Asset, after Accumulated Amortization [Abstract]
Property, plant and equipment, at cost	$ 4,511	$ 2,476
Accumulated amortization	(2,501)	(2,276)
Property, plant and equipment, net	$ 2,010	$ 200
Finance Lease, Right-of-Use Asset, Statement of Financial Position	Property, plant and equipment, net	Property, plant and equipment, net
Finance Lease Liability [Abstract]
Accrued expenses and other current liabilities	$ 673	$ 96
Finance Lease, Liability, Current, Statement of Financial Position	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Other long-term liabilities	$ 1,467	$ 98
Finance Lease, Liability, Noncurrent, Statement of Financial Position	Other long-term liabilities	Other long-term liabilities
Total finance lease liabilities	$ 2,140	$ 194
Finance Lease, Liability, Statement of Financial Position	Other long-term liabilities, Accrued expenses and other current liabilities	Other long-term liabilities, Accrued expenses and other current liabilities