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OTHER COMPREHENSIVE INCOME (LOSS) - AOCI (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Class of Stock [Line Items]            
Accumulated other comprehensive income (loss) $ 764,431 $ 740,047 $ 700,151 $ 476,454 $ 494,693 $ 477,763
Foreign currency translation adjustments            
Class of Stock [Line Items]            
Accumulated other comprehensive income (loss) (11,821)   (25,683)      
Pension and other defined benefit plans            
Class of Stock [Line Items]            
Accumulated other comprehensive income (loss) (43,647)   (46,598)      
Cash flow hedges            
Class of Stock [Line Items]            
Accumulated other comprehensive income (loss) 1,292   189      
Accumulated other comprehensive income (loss), attributable to parent            
Class of Stock [Line Items]            
Accumulated other comprehensive income (loss) $ (54,176) $ (58,951) $ (72,092) $ (73,909) $ (59,075) $ (65,916)