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EMPLOYEE BENEFIT PLANS - Components of Net Periodic Pension Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
United States      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost $ 2,584 $ 3,009 $ 3,086
Expected return on plan assets $ (2,220) $ (2,080) $ (1,762)
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 $ 190 $ 612 $ 1,139
Settlement expense 442 0 0
Net pension expense 996 $ 1,541 $ 2,463
Foreign Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 3,339    
Interest cost 5,549    
Expected return on plan assets $ (1,714)    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, general and administrative    
Net pension expense $ 7,174