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Business Segment Information (Financial Segment Information By Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2014
Segment Reporting Information [Line Items]          
Segment Profit: Net Income (Loss) $ (293,134) $ 64,520 $ (191,724) $ 241,983  
Segment Assets 6,889,668   6,889,668   $ 6,739,597
Revenue From External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 339,815 440,144 1,459,851 1,746,458  
Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Revenue 0 0 0 0  
Exploration And Production [Member]          
Segment Reporting Information [Line Items]          
Segment Profit: Net Income (Loss) (323,113) 32,421 (349,955) 87,908  
Segment Assets 2,718,451   2,718,451   3,100,514
Exploration And Production [Member] | Revenue From External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 159,404 201,522 529,590 594,129  
Exploration And Production [Member] | Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Revenue 0 0 0 0  
Pipeline And Storage [Member]          
Segment Reporting Information [Line Items]          
Segment Profit: Net Income (Loss) 17,714 17,934 61,868 58,444  
Segment Assets 1,532,948   1,532,948   1,367,181
Pipeline And Storage [Member] | Revenue From External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 47,012 48,046 154,515 152,829  
Pipeline And Storage [Member] | Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Revenue 21,833 20,489 66,347 63,463  
Gathering [Member]          
Segment Reporting Information [Line Items]          
Segment Profit: Net Income (Loss) 6,226 8,717 24,254 22,188  
Segment Assets 491,020   491,020   326,662
Gathering [Member] | Revenue From External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 126 343 361 772  
Gathering [Member] | Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Revenue 16,748 18,740 58,541 48,541  
Utility [Member]          
Segment Reporting Information [Line Items]          
Segment Profit: Net Income (Loss) 5,727 4,826 66,558 64,586  
Segment Assets 1,989,884   1,989,884   1,862,850
Utility [Member] | Revenue From External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 110,002 143,760 630,049 751,861  
Utility [Member] | Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Revenue 2,614 3,654 13,670 16,565  
Energy Marketing [Member]          
Segment Reporting Information [Line Items]          
Segment Profit: Net Income (Loss) 1,533 602 7,732 5,971  
Segment Assets 89,197   89,197   76,238
Energy Marketing [Member] | Revenue From External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 22,420 45,737 142,753 243,335  
Energy Marketing [Member] | Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Revenue 379 678 796 938  
Total Reportable Segments [Member]          
Segment Reporting Information [Line Items]          
Segment Profit: Net Income (Loss) (291,913) 64,500 (189,543) 239,097  
Segment Assets 6,821,500   6,821,500   6,733,445
Total Reportable Segments [Member] | Revenue From External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 338,964 439,408 1,457,268 1,742,926  
Total Reportable Segments [Member] | Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Revenue 41,574 43,561 139,354 129,507  
All Other [Member]          
Segment Reporting Information [Line Items]          
Segment Profit: Net Income (Loss) (28) 24 66 978  
Segment Assets 76,650   76,650   86,460
All Other [Member] | Revenue From External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 634 497 1,906 2,795  
All Other [Member] | Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Revenue 0 0 0 0  
Corporate And Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Segment Profit: Net Income (Loss) (1,193) (4) (2,247) 1,908  
Segment Assets (8,482)   (8,482)   $ (80,308)
Corporate And Intersegment Eliminations [Member] | Revenue From External Customers [Member]          
Segment Reporting Information [Line Items]          
Revenue 217 239 677 737  
Corporate And Intersegment Eliminations [Member] | Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Revenue $ (41,574) $ (43,561) $ (139,354) $ (129,507)