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Employee Retirement Plans - Allocation of Pension Plan and VEBA Trust Assets (Details)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Pension Benefits    
Defined Benefit Plan Disclosure    
Actual pension plan 100.00% 100.00%
Target asset allocation 100.00%  
Pension Benefits | Equity Investments    
Defined Benefit Plan Disclosure    
Actual pension plan 64.30% 66.40%
Target asset allocation 65.00%  
Permitted range - minimum 60.00%  
Permitted range - maximum 70.00%  
Pension Benefits | Domestic    
Defined Benefit Plan Disclosure    
Actual pension plan 54.10% 56.20%
Target asset allocation 52.50%  
Permitted range - minimum 40.00%  
Permitted range - maximum 65.00%  
Pension Benefits | International    
Defined Benefit Plan Disclosure    
Actual pension plan 10.20% 10.20%
Target asset allocation 12.50%  
Permitted range - minimum 7.50%  
Permitted range - maximum 17.50%  
Pension Benefits | Fixed Income Funds and Cash Equivalents    
Defined Benefit Plan Disclosure    
Actual pension plan 35.70% 33.60%
Target asset allocation 35.00%  
Permitted range - minimum 30.00%  
Permitted range - maximum 40.00%  
VEBA Trust    
Defined Benefit Plan Disclosure    
Actual pension plan 100.00% 100.00%
Target asset allocation 100.00%  
VEBA Trust | Domestic    
Defined Benefit Plan Disclosure    
Actual pension plan 69.90% 67.40%
Target asset allocation 65.00%  
Permitted range - minimum 60.00%  
Permitted range - maximum 70.00%  
VEBA Trust | Fixed Income Funds and Cash Equivalents    
Defined Benefit Plan Disclosure    
Actual pension plan 30.10% 32.60%
Target asset allocation 35.00%  
Permitted range - minimum 30.00%  
Permitted range - maximum 40.00%