Accounts payable and accrued expenses, and Other noncurrent liabilities - (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Accounts payable and other noncurrent liabilities
Interest expense	$ 357	$ 235
Vendor Agreement
Accounts payable and other noncurrent liabilities
Imputed interest rate	9.20%
Interest expense	$ 346	$ 219