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EMPLOYEE BENEFIT PLANS - DEFINED BENEFIT PLANS (Details) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Jun. 30, 2013
Pension [Member]
Jun. 30, 2012
Pension [Member]
Jun. 30, 2013
Pension [Member]
Jun. 30, 2012
Pension [Member]
Jun. 30, 2013
OPEB [Member]
Jun. 30, 2012
OPEB [Member]
Jun. 30, 2013
OPEB [Member]
Jun. 30, 2012
OPEB [Member]
Dec. 31, 2012
Pension Plans Excluding Pension Equalization Plan, Defined Benefit [Member]
Dec. 31, 2011
Pension Plans Excluding Pension Equalization Plan, Defined Benefit [Member]
Components of net periodic cost                    
Service cost $ 1,718,000 $ 1,344,000 $ 5,154,000 $ 4,032,000 $ 1,171,000 $ 896,000 $ 3,513,000 $ 2,688,000    
Interest cost 2,235,000 2,206,000 6,705,000 6,618,000 1,287,000 1,283,000 3,861,000 3,849,000    
Expected return on plan assets (3,706,000) (3,171,000) (11,118,000) (9,513,000) (913,000) (687,000) (2,739,000) (2,059,000)    
Recognized actuarial loss 1,911,000 1,254,000 5,733,000 3,762,000 964,000 724,000 2,892,000 2,172,000    
Prior service cost amortization 27,000 11,000 81,000 33,000 (281,000) 6,000 (267,000) 18,000    
Recognized net initial obligation 0 0 0 0 199,000 89,000 21,000 267,000    
Net periodic cost 2,185,000 1,644,000 6,555,000 4,932,000 2,427,000 2,311,000 7,281,000 6,935,000    
Defined benefit plan, contributions by employer                 $ 20,000,000 $ 20,000,000