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Supplementary Information For Oil And Gas Producing Activities (Proved Developed And Undeveloped Oil And Gas Reserve Quantities) (Details)
12 Months Ended
Sep. 30, 2014
MMcf
Sep. 30, 2013
MMcf
Sep. 30, 2012
MMcf
Sep. 30, 2011
MMcf
Reserve Quantities [Line Items]        
Proved Undeveloped Reserve (Volume) 512,000,000,000 452,000,000,000 410,000,000,000  
Natural Gas (Mmcf) [Member]
       
Reserve Quantities [Line Items]        
Proved Developed and Undeveloped Reserves 1,299,515 988,434 674,922  
Extensions and Discoveries 446,821 361,624 436,098  
Revisions of Previous Estimates 45,048 53,150 (56,455)  
Production Volume (142,307) (103,693) (66,131)  
Purchases of Minerals in Place 33,986      
Sales of Minerals in Place (179)      
Proved Developed and Undeveloped Reserves 1,682,884 1,299,515 988,434  
Proved Developed Reserves (Volume) 1,177,808 866,917 604,483 414,423
Proved Undeveloped Reserve (Volume) 505,076 432,598 383,951 260,499
Oil Mbbl [Member]
       
Reserve Quantities [Line Items]        
Proved Developed and Undeveloped Reserves 41,598 42,862 43,345  
Extensions and Discoveries 1,539 2,443 1,257  
Revisions of Previous Estimates (1,694) (876) 1,130  
Production Volume (3,036) (2,831) (2,870)  
Purchases of Minerals in Place 83      
Sales of Minerals in Place (13)      
Proved Developed and Undeveloped Reserves 38,477 41,598 42,862  
Proved Developed Reserves (Volume) 37,255 38,365 38,444 37,580
Proved Undeveloped Reserve (Volume) 1,222 3,233 4,418 5,765
West Coast Region [Member] | Natural Gas (Mmcf) [Member]
       
Reserve Quantities [Line Items]        
Proved Developed and Undeveloped Reserves 60,777 63,023 68,316  
Extensions and Discoveries 0 702 638  
Revisions of Previous Estimates 1,358 112 (2,463)  
Production Volume (3,210) (3,060) (3,468)  
Purchases of Minerals in Place 0      
Sales of Minerals in Place (103)      
Proved Developed and Undeveloped Reserves 58,822 60,777 63,023  
Proved Developed Reserves (Volume) 57,907 59,862 59,923 63,965
Proved Undeveloped Reserve (Volume) 915 915 3,100 4,351
West Coast Region [Member] | Oil Mbbl [Member]
       
Reserve Quantities [Line Items]        
Proved Developed and Undeveloped Reserves 41,315 42,556 43,066  
Extensions and Discoveries 1,521 2,443 1,229  
Revisions of Previous Estimates (1,677) (881) 1,095  
Production Volume (3,005) (2,803) (2,834)  
Purchases of Minerals in Place 83      
Sales of Minerals in Place (13)      
Proved Developed and Undeveloped Reserves 38,224 41,315 42,556  
Proved Developed Reserves (Volume) 37,002 38,082 38,138 37,306
Proved Undeveloped Reserve (Volume) 1,222 3,233 4,418 5,760
Appalachian Region [Member] | Natural Gas (Mmcf) [Member]
       
Reserve Quantities [Line Items]        
Proved Developed and Undeveloped Reserves 1,238,738 925,411 606,606  
Extensions and Discoveries 446,821 [1] 360,922 [1] 435,460 [1]  
Revisions of Previous Estimates 43,690 53,038 (53,992)  
Production Volume (139,097) [2] (100,633) [2] (62,663) [2]  
Purchases of Minerals in Place 33,986      
Sales of Minerals in Place (76)      
Proved Developed and Undeveloped Reserves 1,624,062 1,238,738 925,411  
Proved Developed Reserves (Volume) 1,119,901 807,055 544,560 350,458
Proved Undeveloped Reserve (Volume) 504,161 431,683 380,851 256,148
Appalachian Region [Member] | Oil Mbbl [Member]
       
Reserve Quantities [Line Items]        
Proved Developed and Undeveloped Reserves 283 306 279  
Extensions and Discoveries 18 0 28  
Revisions of Previous Estimates (17) 5 35  
Production Volume (31) (28) (36)  
Purchases of Minerals in Place 0      
Sales of Minerals in Place 0      
Proved Developed and Undeveloped Reserves 253 283 306  
Proved Developed Reserves (Volume) 253 283 306 274
Proved Undeveloped Reserve (Volume) 0 0 0 5
Marcellus Shale Fields [Member]
       
Reserve Quantities [Line Items]        
Proved Undeveloped Reserve (Volume) 504,000,000,000 432,000,000,000 381,000,000,000  
Marcellus Shale Fields [Member] | Natural Gas (Mmcf) [Member]
       
Reserve Quantities [Line Items]        
Extensions and Discoveries 442,000 355,000 435,000  
Production Volume 131,590 93,999 55,812  
Percentage exceeding total reserve of production in proved developed and undeveloped reserves 15.00%      
[1] Extensions and discoveries include 435 Bcf (during 2012), 355 Bcf (during 2013) and 442 Bcf (during 2014), of Marcellus Shale gas in the Appalachian Region.
[2] Production includes 55,812 MMcf (during 2012), 93,999 MMcf (during 2013) and 131,590 MMcf (during 2014), from Marcellus Shale fields (which exceed 15% of total reserves).