DEFINED BENEFIT PLAN - Net periodic benefit costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Components of net periodic expense:
Interest cost	$ 178	$ 181
Expected return on assets	(221)	(192)
Amortization of prior loss	(23)	(35)
Net periodic expense	$ (66)	$ (46)
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