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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Income Tax Examination [Line Items]    
Valuation allowance increase (decrease) $ 3,714 $ 8,997
Undistributed earnings of foreign subsidiaries 122,964  
Undistributed earnings of foreign subsidiaries, amount previously subjected to federal income tax 38,703  
Unremitted foreign earnings 1,514 1,896
Deferred tax assets, valuation allowance 30,703 26,989
Potential tax benefits impact on effective tax rate 1,603  
Liability for uncertainty in income taxes, current 402 310
Domestic Tax Authority    
Income Tax Examination [Line Items]    
Operating loss carryforwards 0 0
Tax credit carryforward amount 5,933 5,933
Non-U.S. Tax Authority    
Income Tax Examination [Line Items]    
Operating loss carryforwards 75,849 63,217
State and Local Jurisdiction    
Income Tax Examination [Line Items]    
Operating loss carryforwards $ 221,855 $ 228,485