FAIR VALUE MEASUREMENTS - Reconciliation of derivative assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
FAIR VALUE MEASUREMENTS
Beginning balance	$ 268	$ (238)	$ 1,567
Unrealized gains (losses) recognized in earnings, net of settlements	(268)	506	(1,805)
Ending balance	$ 0	$ 268	$ (238)