LEASES - Right-of-use lease assets and lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Right-of-use lease assets and lease liabilities
Operating ROU assets, net	$ 32,489	$ 8,358
Current portion of operating lease liabilities	7,982	1,959
Long-term operating lease liabilities	24,854	6,554
Total operating lease liabilities	32,836	8,513
Finance ROU assets, net	$ 79	$ 60
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Current portion of long-term finance lease	$ 43	$ 24
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Long-term finance lease liabilities	$ 41	$ 39
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Total finance lease liabilities	$ 84	$ 63