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EMPLOYEE BENEFIT PLANS - Components of the Net Periodic Pension Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
U.S. Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 657 754 1,971 2,262
Expected return on plan assets (573) (482) (1,719) (1,446)
Recognized net actuarial loss 69 174 207 522
Settlement expense 303 0 303 0
Net pension expense 456 $ 446 762 $ 1,338
Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1,157   2,121  
Interest cost 1,663   3,245  
Expected return on plan assets (586)   (1,140)  
Recognized net actuarial loss 0   0  
Settlement expense 0   0  
Net pension expense $ 2,234   $ 4,226