OTHER COMPREHENSIVE INCOME (LOSS) - Summary of OCI (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	$ (12,812)			$ 3,214			$ (11,401)
Total other comprehensive income (loss), tax	(1,365)			(475)			(578)
Total other comprehensive income (loss), net of taxes	(14,177)	$ 4,949	$ (2,751)	2,739	$ 4,775	$ 13,141	(11,979)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	(17,823)			1,160			(14,093)
Total other comprehensive income (loss), tax	0			0			0
Total other comprehensive income (loss), net of taxes	(17,823)			1,160			(14,093)
Pension and other defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	1,511			1,576			2,534
Total other comprehensive income (loss), tax	(315)			(331)			(530)
Total other comprehensive income (loss), net of taxes	1,196			1,245			2,004
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	3,500			478			158
Total other comprehensive income (loss), tax	(1,050)			(144)			(48)
Total other comprehensive income (loss), net of taxes	$ 2,450			$ 334			$ 110