OTHER COMPREHENSIVE INCOME (LOSS) - Summary of OCI (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	$ (664)			$ (12,812)			$ 14,997	$ (11,401)
Total other comprehensive income (loss), tax	979			(1,365)			150	(578)
Total other comprehensive income (loss), net of taxes	315	$ 2,613	$ 12,219	(14,177)	$ 4,949	$ (2,751)	15,147	(11,979)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	2,309			(17,823)			14,580	(14,093)
Total other comprehensive income (loss), tax	0			0			0	0
Total other comprehensive income (loss), net of taxes	2,309			(17,823)			14,580	(14,093)
Pension and other defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	943			1,511			2,972	2,534
Total other comprehensive income (loss), tax	(196)			(315)			(617)	(530)
Total other comprehensive income (loss), net of taxes	747			1,196			2,355	2,004
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	(3,916)			3,500			(2,555)	158
Total other comprehensive income (loss), tax	1,175			(1,050)			767	(48)
Total other comprehensive income (loss), net of taxes	$ (2,741)			$ 2,450			$ (1,788)	$ 110