LEASES - Right-of-use lease assets and lease liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Right-of-use lease assets and lease liabilities
Operating right-of-use assets, net	$ 29,116	$ 8,358
Current portion of operating lease liabilities	6,151	1,959
Long-term operating lease liabilities	22,901	6,554
Total operating lease liabilities	29,052	8,513
Finance lease right-of-use assets, net	51	60
Current portion of finance lease liabilities	21	24
Long-term finance lease liabilities	33	39
Total finance lease liabilities	$ 54	$ 63