LEASES - Supplemental cash flow information (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 5,491	$ 2,722
Operating cash flows from finance leases	23	1
Finance cash flows from finance leases	2	13
Non-cash lease activity:
ROU assets obtained in exchange for new operating lease liabilities	$ 14,080	18,091
Right-of-use assets obtained in exchange for new finance lease liabilities		$ 10