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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Components of net periodic cost        
Discretionary contribution     $ 30,000,000 $ 0
Pension [Member]        
Components of net periodic cost        
Service cost $ 1,898,000 $ 1,871,000 3,796,000 3,742,000
Interest cost 2,835,000 2,550,000 5,671,000 5,100,000
Expected return on plan assets (5,030,000) (4,273,000) (10,059,000) (8,545,000)
Recognized actuarial loss 1,821,000 1,747,000 3,641,000 3,492,000
Prior service cost amortization 27,000 27,000 55,000 55,000
Net periodic benefit cost 1,551,000 1,922,000 3,104,000 3,844,000
OPEB [Member]        
Components of net periodic cost        
Service cost 1,131,000 1,064,000 2,261,000 2,127,000
Interest cost 1,564,000 1,435,000 3,128,000 2,870,000
Expected return on plan assets (1,211,000) (1,244,000) (2,422,000) (2,488,000)
Recognized actuarial loss 818,000 735,000 1,637,000 1,471,000
Prior service cost amortization (91,000) (91,000) (182,000) (182,000)
Net periodic benefit cost $ 2,211,000 $ 1,899,000 $ 4,422,000 $ 3,798,000