SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, PENSION AND POSTEMPLOYMENT PLANS (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2015 USD ($) plan	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of noncontributory defined benefit retirement plans	2
Number of noncontributory medical and life insurance plans	2
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions | $	$ 5,672	$ 4,970	$ 6,000