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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Components of net periodic cost    
Discretionary contribution $ 0 $ 0
Pension    
Components of net periodic cost    
Service cost 1,845,000 2,035,000
Interest cost 3,043,000 2,623,000
Expected return on plan assets (4,763,000) (4,910,000)
Recognized actuarial loss 1,441,000 1,884,000
Prior service cost amortization 25,000 27,000
Net periodic benefit cost 1,591,000 1,659,000
OPEB    
Components of net periodic cost    
Service cost 1,101,000 1,152,000
Interest cost 2,081,000 1,591,000
Expected return on plan assets (1,379,000) (1,338,000)
Recognized actuarial loss 1,617,000 1,165,000
Prior service cost amortization (91,000) (91,000)
Net periodic benefit cost $ 3,329,000 $ 2,479,000