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POST EMPLOYMENT BENEFITS - Net periodic benefit costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Components of net periodic benefit expense: |  |
Interest cost | $ 741 | $ 733
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Expense, Nonoperating | Interest Expense, Nonoperating
Expected return on assets | $ (786) | $ (798)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income
Amortization of prior gain | $ 142 | $ 152
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income
Net periodic benefit cost | $ (187) | $ (217)

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