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EMPLOYEE BENEFIT PLANS, WEIGHTED AVERAGE ASSUMPTIONS (Details)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Pension      
Benefit costs:      
Discount rate 4.50% 4.55% 5.15%
Expected asset return 8.75% 8.75% 8.25%
Compensation increase   3.25% 3.25%
Obligations:      
Discount rate   4.50% 4.55%
Pension | Represented      
Benefit costs:      
Compensation increase [1] 3.25%    
Obligations:      
Discount rate [1] 3.96%    
Compensation increase [1] 3.25% 3.25% 3.25%
Pension | Nonrepresented      
Benefit costs:      
Compensation increase [1] 3.50%    
Obligations:      
Discount rate [1] 3.94%    
Compensation increase [1] 3.50% 3.50% 3.50%
OPEB      
Benefit costs:      
Discount rate   4.55% 5.15%
Expected asset return 8.75% 8.75% 8.25%
Compensation increase 3.50% 3.50% 3.50%
Obligations:      
Discount rate     4.55%
Compensation increase 3.50% 3.50% 3.50%
OPEB | Represented      
Obligations:      
Discount rate [1] 4.08% 4.60%  
OPEB | Nonrepresented      
Obligations:      
Discount rate [1] 4.01% 4.55%  
Minimum | OPEB      
Benefit costs:      
Discount rate 4.60%    
Maximum | OPEB      
Benefit costs:      
Discount rate 4.55%    
[1] Percentages for represented and nonrepresented plans, respectively.