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 |