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EMPLOYEE BENEFIT PLANS - Components of Net Periodic Pension Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Retirement Benefits [Abstract]      
Interest cost $ 3,086 $ 2,537 $ 2,925
Expected return on plan assets $ (1,762) $ (2,481) $ (3,722)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, general and administrative Selling, general and administrative Selling, general and administrative
Recognized net actuarial loss $ 1,139 $ 2,080 $ 3,205
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, general and administrative Selling, general and administrative Selling, general and administrative
Settlement expense $ 0 $ 9,031 $ 3,448
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, general and administrative Selling, general and administrative Selling, general and administrative
Other $ 0 $ 0 $ (81)
Net pension expense $ 2,463 $ 11,167 $ 5,775