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EMPLOYEE BENEFIT PLANS - Defined Benefit Plans (Details) (USD $)
 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Pension [Member]
    
Components of net periodic cost    
Service cost $ 1,718,000 $ 1,344,000
Interest cost 2,235,000 2,206,000
Expected return on plan assets (3,706,000) (3,171,000)
Recognized actuarial loss 1,911,000 1,254,000
Prior service cost amortization 27,000 11,000
Recognized net initial obligation 0 0
Net periodic cost 2,185,000 1,644,000
OPEB [Member]
    
Components of net periodic cost    
Service cost 1,171,000 896,000
Interest cost 1,287,000 1,283,000
Expected return on plan assets (913,000) (686,000)
Recognized actuarial loss 964,000 724,000
Prior service cost amortization 7,000 6,000
Recognized net initial obligation (89,000) 89,000
Net periodic cost 2,427,000 2,312,000
Pension Plans Excluding Pension Equalization Plan, Defined Benefit [Member]
    
Components of net periodic cost    
Defined benefit plan, contributions by employer $ 20,000,000 $ 20,000,000