OTHER COMPREHENSIVE INCOME (LOSS) - Accumulated other comprehensive income (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
SHAREHOLDERS’ EQUITY	$ 477,570	$ 807,158	$ 700,151	$ 477,763
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
SHAREHOLDERS’ EQUITY	(57,170)	(19,250)
Pension amortization
Accumulated Other Comprehensive Income (Loss) [Line Items]
SHAREHOLDERS’ EQUITY	(27,299)	(28,802)
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
SHAREHOLDERS’ EQUITY	1,731	2,075
AOCI attributable to parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
SHAREHOLDERS’ EQUITY	$ (82,738)	$ (45,977)	$ (72,092)	$ (65,916)