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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2017
Jun. 30, 2016
Components of net periodic cost          
Discretionary contribution     $ 30,000,000 $ 0  
Pension          
Components of net periodic cost          
Service cost $ 2,086,000 $ 1,897,000   6,260,000 $ 5,693,000
Interest cost 2,443,000 2,836,000   7,328,000 8,507,000
Expected return on plan assets (4,829,000) (5,029,000)   (14,485,000) (15,088,000)
Recognized actuarial loss 2,207,000 1,820,000   6,620,000 5,461,000
Prior service cost amortization 28,000 28,000   83,000 83,000
Net periodic benefit cost 1,935,000 1,552,000   5,806,000 4,656,000
OPEB          
Components of net periodic cost          
Service cost 1,095,000 1,130,000   3,285,000 3,391,000
Interest cost 1,386,000 1,564,000   4,159,000 4,692,000
Expected return on plan assets (1,192,000) (1,211,000)   (3,575,000) (3,633,000)
Recognized actuarial loss 1,093,000 819,000   3,278,000 2,456,000
Prior service cost amortization (91,000) (91,000)   (273,000) (273,000)
Net periodic benefit cost $ 2,291,000 $ 2,211,000   $ 6,874,000 $ 6,633,000