DEFINED BENEFIT PENSION EXPENSE (Details) - Summary of Defined Benefit Pension Expense - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Interest cost	$ 1,402	$ 2,080	$ 2,804	$ 4,160
Expected return on plan assets	(2,736)	(2,916)	(5,472)	(5,832)
Amortization:
Prior service cost	4	4	8	8
Recognized actuarial loss	832	591	1,664	1,181
Net periodic expense (income)	$ (498)	$ (241)	$ (996)	$ (483)