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Supplemental Information Relating to Oil and Natural Gas Producing Activities (Unaudited) - Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities (Details)
 8 Months Ended 12 Months Ended
Sep. 30, 2013
Mcfe
MBbls
MMcf
Sep. 30, 2013
Mcfe
MBbls
MMcf
Sep. 30, 2015
Mcfe
MBbls
MMcf
Sep. 30, 2014
Mcfe
MBbls
MMcf
Proved Developed and Undeveloped Reserves [Abstract]        
Proved Developed and Undeveloped Reserve, Reclassification to unproved reserves (Energy) | Mcfe     (5,993)  
Proved Developed and Undeveloped Reserve, Changes in Price (Energy) | Mcfe   11,556 (74,651) 25,189
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]        
Beginning of period | Mcfe     368,900 377,342
Purchase of reserves in place (1) | Mcfe   399,350 125,502  
Discoveries and extensions (2) | Mcfe   10,062 1,007 2,549
Production | Mcfe   (18,068) (31,447) (26,492)
End of period | Mcfe 377,342 377,342 387,416 368,900
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) | Mcfe   (25,558) 6,562 (9,688)
Proved Developed and Undeveloped Reserves, Sale of Mineral in Place (Energy) | Mcfe     (2,464)  
Oil | Compass        
Proved Developed and Undeveloped Reserves [Abstract]        
Beginning of period     3,690 3,424
Purchase of reserves in place   3,940 1,252  
Discoveries and extensions   188 153 0 [1]
Proved Developed and Undeveloped Reserves, Reclassification to Unproved Reserves     (110)  
Changes in price       0
Other factors   (125) (964) 0 [2]
Production   (283) 0 (414)
Enf of period 3,424 3,424 4,238 3,690
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]        
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates   (296) 708  
Proved Developed Reserves (Volume)     4,085,000 3,356,000
Proved Undeveloped Reserve (Volume)     153,000 334,000
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place     (12)  
Natural Gas | Compass        
Proved Developed and Undeveloped Reserves [Abstract]        
Beginning of period | MMcf     309,440 322,418
Purchase of reserves in place | MMcf   331,592 105,297  
Discoveries and extensions | MMcf   4,416 44 839
Proved Developed and Undeveloped Reserves, Reclassification to Unproved Reserves | MMcf     (4,954)  
Changes in price | MMcf       20,815
Other factors | MMcf   13,116 (51,704) (13,750)
Production | MMcf   (14,570) (24,934) (20,882)
Enf of period | MMcf 322,418 322,418 329,529 309,440
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]        
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | MMcf   (12,136) (1,269)  
Proved Developed Reserves (Volume) | MMcf     329,485,000 304,628,000
Proved Undeveloped Reserve (Volume) | MMcf     44,000 4,812,000
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place | MMcf     (2,391)  
Natural Gas Liquids | Compass        
Proved Developed and Undeveloped Reserves [Abstract]        
Beginning of period     6,220 5,730
Purchase of reserves in place   7,353 2,116  
Discoveries and extensions   753 8 173
Proved Developed and Undeveloped Reserves, Reclassification to Unproved Reserves     (63)  
Changes in price       496
Other factors   (135) (2,860) 342
Production   (300) (606) (521)
Enf of period 5,730 5,730 5,411 6,220
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]        
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates   (1,941) 596  
Proved Developed Reserves (Volume)     5,403,000 5,145,000
Proved Developed Reserves (Energy) | Mcfe     386,409,000 355,634,000
Proved Undeveloped Reserve (Volume)     8,000 1,075,000
Proved Undeveloped Reserves (Energy) | Mcfe     1,007,000 13,266,000
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place     0  
Permian Basin | Compass        
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]        
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates (Energy), Other Factors | Mcfe 18,100,000,000      
East Texas/North Louisiana | Compass        
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]        
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates (Energy), Other Factors | Mcfe 7,500,000,000     11.5
[1] New discoveries and extensions were a result of Compass’ development in the Permian basin for Fiscal 2015,
[2] Revisions of previous estimates due to other factors were primarily due to downward adjustments in the Permian basin of 18.1 Bcfe as a result of recent performance and modifications to Compass’ development plans which extended the development beyond a five-year horizon. In addition, revisions of previous estimates due to other factors in the East Texas/North Louisiana region were 7.5 Bcfe primarily due to performance.