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OTHER COMPREHENSIVE INCOME (LOSS) - AOCI (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) $ 740,047 $ 700,151 $ 494,693 $ 477,763
Foreign currency translation adjustments        
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) (13,560) (25,683)    
Pension and other defined benefit plans        
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) (44,892) (46,598)    
Cash flow hedges        
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) (499) 189    
Accumulated other comprehensive income (loss), attributable to parent        
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) $ (58,951) $ (72,092) $ (59,075) $ (65,916)