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OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Accumulated other comprehensive income - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
SHAREHOLDERS’ EQUITY $ 700,151 $ 477,763 $ 474,391 $ 398,808
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
SHAREHOLDERS’ EQUITY (25,683) (31,284)    
Pension and other defined benefit plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
SHAREHOLDERS’ EQUITY (46,598) (34,814)    
Cash flow hedge        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
SHAREHOLDERS’ EQUITY 189 182    
AOCI attributable to parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
SHAREHOLDERS’ EQUITY $ (72,092) $ (65,916) $ (34,112) $ (60,481)