EMPLOYEE BENEFIT PLANS - DEFINED BENEFIT PLANS (Details) (USD $)	3 Months Ended					12 Months Ended
	Dec. 31, 2013 Pension [Member]	Dec. 31, 2012 Pension [Member]	Dec. 31, 2013 OPEB [Member]	Dec. 31, 2012 OPEB [Member]	Dec. 31, 2013 Pension Plans Excluding Pension Equalization Plan, Defined Benefit [Member]	Sep. 30, 2013 Pension Plans Excluding Pension Equalization Plan, Defined Benefit [Member]
Components of net periodic cost
Service cost	$ 1,536,000	$ 1,718,000	$ 981,000	$ 1,171,000
Interest cost	2,516,000	2,235,000	1,433,000	1,287,000
Expected return on plan assets	(3,869,000)	(3,706,000)	(1,044,000)	(913,000)
Recognized actuarial loss	1,399,000	1,911,000	625,000	964,000
Prior service cost amortization	28,000	27,000	(89,000)	7,000
Recognized net initial obligation	0	0	3,000	(89,000)
Net periodic cost	1,610,000	2,185,000	1,909,000	2,427,000
Defined benefit plan, contributions by employer					$ 0	$ 20,000,000