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Commitments and Contingencies Commitments and Contingencies - Contingencies (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
USD ($)
Units
Insurance_layers
Procedures
Sites
reactors
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Contingencies      
Nuclear liability insurance $ 375,000    
Assessment from licensees for each licensed reactor $ 127,000    
Number of licensed reactors in US | reactors 102    
Nuclear accident assessment limitation per year per unit $ 19,000    
Number of licensed nuclear units | Units 6    
Maximum assessment per nuclear incident $ 764,000    
Maximum payment required per accident in any one year 114,000    
maximum payment required per accident in any one year after addition of unit under construction 133,000    
Maximum assessment per nuclear incident after addition of unit under construction 891,000    
Total amount of protection available $ 13,000,000    
Surcharge for legal expenses 5.00%    
The U.S. Congress is required to take action if these layes are exhausted | Insurance_layers 2    
Amount of property, decommissioning, and decontamination insurance carried $ 5,100,000    
Amount of insurance available for loss at any one site $ 2,100,000    
Number of sites | Sites 1    
Maximum amount of retrospective premiums $ 127,000    
Maximum idemnity if a covered accident tasks or keeps a nuclear unit offline 490,000    
Maximum amount of retrospective premiums $ 36,000    
Number of procedures for determining estimates for the costs of nuclear decommissioning | Procedures 2    
Amount spent to reduce emissions since 1970 $ 6,200,000    
Amount spent to reduce emissions 315,000 $ 378,000 $ 197,000
Possible additional future costs for compliance with Clean Air Act requirements 750,000    
Amount of settlement for potential liability related to soil cleanup 300    
Amount of settlement for potential liability related to EPA study of site 8    
Remaining natural resource damages are less than 1,000    
Estimated liability for cleanup and similar environmental work on a non-discounted basis 23,000 $ 15,000  
Decommissioning Fund Investments, Fair Value 435,000    
Nuclear Decommissioning Fund Investments, Fair Value 1,500,000    
Nuclear | Nuclear      
Contingencies      
Decommissioning Liability, Noncurrent 2,200,000    
Non-nuclear | Non-nuclear      
Contingencies      
Decommissioning Liability, Noncurrent $ 1,700,000