OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Summary of Amounts Reclassified from Accumulated Other Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pension amortization	$ (902)	$ (1,397)	$ (3,343)
Cash flow hedges	1,932	657	(1,458)
Total before tax	1,030	(740)	(4,801)
Tax	(216)	155	1,680
Net of tax	$ 814	$ (585)	$ (3,121)