DEFINED BENEFIT PLAN - Net periodic benefit costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Components of net periodic costs:
Interest cost	$ 181	$ 182
Expected return on assets	(192)	(198)
Amortization of prior gain	(35)	(38)
Net periodic benefit costs	$ (46)	$ (54)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	General and Administrative Expense	General and Administrative Expense