DEFINED BENEFIT PLAN - Net periodic benefit costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Components of net periodic benefit expense (income):
Interest cost	$ 190	$ 178
Expected return on assets	(236)	(221)
Amortization of prior gain, net	(25)	(23)
Net periodic benefit income	$ (71)	$ (66)
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