LEASES - Components of lease expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Operating lease costs:
Fixed operating lease costs	$ 3,491	$ 3,322	$ 6,594	$ 5,914
Short-term lease costs	0	50	0	62
Lease income	(794)	(811)	(1,558)	(1,485)
Total operating lease cost	$ (2,697)	$ (2,561)	$ (5,036)	$ (4,491)