OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Summary of Amounts Reclassified from Accumulated Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pension amortization	$ (836)	$ (593)	$ (2,508)	$ (1,782)
Cash flow hedges	(88)	(764)	(910)	324
Total gain (loss)	(924)	(1,357)	(3,418)	(1,458)
Tax benefit (expense)	(277)	(407)	(1,025)	(438)
Amounts reclassified from accumulated other comprehensive income (loss)	$ (647)	$ (950)	$ (2,393)	$ (1,020)