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Employee Retirement Plans - Allocation of Pension Plan and VEBA Trust Assets (Details)
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
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 66.40% 66.90%
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 56.20% 55.60%
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% 11.30%
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 33.60% 33.10%
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 67.40% 67.90%
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 32.60% 32.10%
Target asset allocation 35.00%  
Permitted range - minimum 30.00%  
Permitted range - maximum 40.00%