LEASES - Components of lease expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating lease costs:
Fixed operating lease costs	$ 3,103	$ 2,592
Short-term lease costs	0	12
Lease income	(764)	(674)
Total operating lease cost	$ 2,339	$ 1,930