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EMPLOYEE BENEFIT PLANS, PENSION AND OTHER POSTEMPLOYMENT BENEFIT PLANS, NARRATIVE (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
plan
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Number of noncontributory defined benefit retirement plans | plan     2    
Required number of years of service     1 year    
Years of service and average compensation, basis period for plan benefits     60 months    
Special termination benefits   $ 5,000,000      
Pension and postemployment benefit costs   3,500,000      
Other special termination benefits   $ 1,500,000      
Long-term real rate of return on assets (as a percent)     6.00%    
Pension [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Employer discretionary contributions     $ 0 $ 0  
OPEB [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Special termination benefits     0 648,000 $ 0
Employer contributions     5,672,000 $ 4,970,000 $ 6,000,000
OPEB [Member] | Minimum [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Estimated future employer contributions over the next five years     3,000,000    
OPEB [Member] | Maximum [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Estimated future employer contributions over the next five years     $ 5,000,000    
Scenario, Forecast [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Employer discretionary contributions $ 30,000,000