OTHER COMPREHENSIVE INCOME (LOSS) - AOCI (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ 285,022	$ 315,244	$ 526,848	$ 477,570
Accumulated other comprehensive income (loss), attributable to parent
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(59,535)	(70,010)	$ (70,519)	$ (82,738)
Foreign currency translation adjustments
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(38,485)	(48,723)
Pension and other defined benefit plans
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(20,133)	(20,665)
Cash flow hedges
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ (917)	$ (622)