OTHER COMPREHENSIVE INCOME (LOSS) - AOCI (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022
Class of Stock [Line Items]
Total	$ 202,186	$ 285,022	$ 315,244	$ 468,311	$ 526,848	$ 477,570
Total
Class of Stock [Line Items]
Total	(64,431)	$ (59,535)	(70,010)	$ (67,906)	$ (70,519)	$ (82,738)
Foreign currency translation adjustments
Class of Stock [Line Items]
Total	(45,684)		(48,723)
Pension and other defined benefit plans
Class of Stock [Line Items]
Total	(19,602)		(20,665)
Cash flow hedges
Class of Stock [Line Items]
Total	$ 855		$ (622)