EMPLOYEE BENEFIT PLANS - DEFINED BENEFIT PLANS (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Jul. 31, 2014 Subsequent Event [Member]	Jun. 30, 2014 Pension [Member]	Jun. 30, 2013 Pension [Member]	Jun. 30, 2014 Pension [Member]	Jun. 30, 2013 Pension [Member]	Jun. 30, 2014 OPEB [Member]	Jun. 30, 2013 OPEB [Member]	Jun. 30, 2014 OPEB [Member]	Jun. 30, 2013 OPEB [Member]	Jun. 30, 2014 Pension Plans Excluding Pension Equalization Plan, Defined Benefit [Member]	Jun. 30, 2013 Pension Plans Excluding Pension Equalization Plan, Defined Benefit [Member]
Components of net periodic cost
Service cost		$ 1,536,000	$ 1,718,000	$ 4,608,000	$ 5,154,000	$ 980,000	$ 1,171,000	$ 2,942,000	$ 3,513,000
Interest cost		2,517,000	2,235,000	7,550,000	6,705,000	1,434,000	1,287,000	4,300,000	3,861,000
Expected return on plan assets		(3,869,000)	(3,706,000)	(11,607,000)	(11,118,000)	(1,043,000)	(913,000)	(3,130,000)	(2,739,000)
Recognized actuarial loss		1,399,000	1,911,000	4,197,000	5,733,000	625,000	964,000	1,875,000	2,892,000
Prior service cost amortization		27,000	27,000	83,000	81,000	(89,000)	(281,000)	(267,000)	(267,000)
Recognized net initial obligation		0	0	0	0	3,000	199,000	8,000	21,000
Net periodic cost		1,610,000	2,185,000	4,831,000	6,555,000	1,910,000	2,427,000	5,728,000	7,281,000
Defined benefit plan, contributions by employer										0	20,000,000
One-time expense for related postemployment benefit costs and other termination benefits	$ 5,100,000