LEASES - Schedule of Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Operating lease costs	$ 747	$ 1,784	$ 2,025
Short-term lease costs	528	384	150
Variable lease costs	203	249	169
Total lease costs	$ 1,478	$ 2,417	$ 2,344