OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Summary of Amounts Reclassified from Accumulated Other Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pension amortization	$ (1,397)	$ (3,343)	$ (2,375)
Cash flow hedges	657	(1,458)	(752)
Total before tax	(740)	(4,801)	(3,127)
Tax	155	1,680	1,094
Net of tax	$ (585)	$ (3,121)	$ (2,033)