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EMPLOYEE BENEFIT PLANS - DEFINED BENEFIT PLANS (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2014
Pension [Member]
Mar. 31, 2013
Pension [Member]
Mar. 31, 2014
Pension [Member]
Mar. 31, 2013
Pension [Member]
Mar. 31, 2014
OPEB [Member]
Mar. 31, 2013
OPEB [Member]
Mar. 31, 2014
OPEB [Member]
Mar. 31, 2013
OPEB [Member]
Mar. 31, 2014
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 $ 3,072,000 $ 3,436,000 $ 981,000 $ 1,171,000 $ 1,962,000 $ 2,342,000    
Interest cost 2,517,000 2,235,000 5,033,000 4,470,000 1,433,000 1,287,000 2,866,000 2,574,000    
Expected return on plan assets (3,869,000) (3,706,000) (7,738,000) (7,412,000) (1,043,000) (913,000) (2,087,000) (1,826,000)    
Recognized actuarial loss 1,399,000 1,911,000 2,798,000 3,822,000 625,000 964,000 1,250,000 1,928,000    
Prior service cost amortization 28,000 27,000 56,000 54,000 (89,000) 7,000 (178,000) 14,000    
Recognized net initial obligation 0 0 0 0 2,000 (89,000) 5,000 (178,000)    
Net periodic cost 1,611,000 2,185,000 3,221,000 4,370,000 1,909,000 2,427,000 3,818,000 4,854,000    
Defined benefit plan, contributions by employer                 $ 0 $ 20,000,000