ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Amounts Reclassified (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net reclassifications for the period	$ 156	$ 200
Defined benefit pension items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of net loss (included within other income, net)	208	266	$ 667
Tax expense	(52)	(66)	(166)
Net reclassifications for the period	$ 156	$ 200	$ 501