DEFINED BENEFIT PLAN - Net periodic benefit costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Components of net periodic benefit:
Interest cost	$ 191	$ 185	$ 555	$ 551
Expected return on assets	(238)	(196)	(690)	(585)
Amortization of prior gain, net	(24)	(36)	(71)	(106)
Net periodic benefit	$ (71)	$ (47)	$ (206)	$ (140)
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	General and Administrative Expense	General and Administrative Expense