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Summary Of Significant Accounting Policies (Schedule Of Depreciable Plant By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]    
Depreciable plant $ 7,791,390 $ 7,006,331
Utility [Member]
   
Segment Reporting Information [Line Items]    
Depreciable plant 1,833,104 1,778,140
Pipeline And Storage [Member]
   
Segment Reporting Information [Line Items]    
Depreciable plant 1,609,593 1,547,192
Exploration And Production [Member]
   
Segment Reporting Information [Line Items]    
Depreciable plant 3,996,834 3,437,767
Energy Marketing [Member]
   
Segment Reporting Information [Line Items]    
Depreciable plant 3,366 3,460
Gathering [Member]
   
Segment Reporting Information [Line Items]    
Depreciable plant 239,507 130,082
All Other And Corporate [Member]
   
Segment Reporting Information [Line Items]    
Depreciable plant $ 108,986 $ 109,690