OTHER COMPREHENSIVE INCOME (LOSS) - Summary of OCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	$ (3,044)	$ 13,290
Total other comprehensive income (loss), tax	293	(149)
Total other comprehensive income (loss), net of taxes	(2,751)	13,141
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	(2,319)	12,123
Total other comprehensive income (loss), tax	0	0
Total other comprehensive income (loss), net of taxes	(2,319)	12,123
Pension and other defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	846	2,150
Total other comprehensive income (loss), tax	(178)	(444)
Total other comprehensive income (loss), net of taxes	668	1,706
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	(1,571)	(983)
Total other comprehensive income (loss), tax	471	295
Total other comprehensive income (loss), net of taxes	$ (1,100)	$ (688)