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DEFINED BENEFIT PLAN - Net periodic benefit costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Components of net periodic expense:        
Interest cost $ 186 $ 185 $ 364 $ 366
Expected return on assets (231) (197) (452) (389)
Amortization of prior loss (24) (35) (47) (70)
Net periodic expense $ (69) $ (47) $ (135) $ (93)
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