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POST EMPLOYMENT BENEFITS - Net periodic benefit costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Components of net periodic benefit expense:      
Interest cost $ 772 $ 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 $ (961) $ (786) (798)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other (expense) income Other (expense) income  
Amortization of prior gain $ 90 $ 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 (expense) income Other (expense) income  
Net periodic benefit income $ (279) $ (187) $ (217)