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Supplemental Information Relating to Oil and Natural Gas Producing Activities (Unaudited) (Tables)
 12 Months Ended
Sep. 30, 2013
Extractive Industries [Abstract]  
Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure
Presented below are costs incurred in oil and natural gas property acquisition, exploration and development activities:
(in millions, except per unit amounts)
  
Amount
Period from inception to September 30, 2013:
 
 
Proved property acquisition costs
 
$
569.5

Unproved property acquisition costs
 
53.9

Total property acquisition costs
 
623.4

Development
 
11.8

Exploration costs
 
—

Lease acquisitions and other
 
—

Capitalized asset retirement costs
 
0.1

Depreciation, depletion and amortization per Boe
 
$
10.30

Depreciation, depletion and amortization per Mcfe
 
$
1.72
Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities
 
  
Oil
 (Mbbls)
 
Natural
 Gas
 (Mmcf)
 
Natural Gas Liquids (Mbbls)
 
Natural Gas Equivalent (Mmcfe)
Inception
  
3,747

 
268,447

 
6,113

 
327,607

Purchase of reserves in place (1)
  
193

 
63,145

 
1,240

 
71,743

Discoveries and extensions (2)
  
188

 
4,416

 
753

 
10,062

Revisions of previous estimates:
  
 
 
 
 
 
 
 
Changes in price
  
(125
)
 
13,116

 
(135
)
 
11,556

Other factors (3)
  
(296
)
 
(12,136
)
 
(1,941
)
 
(25,558
)
Sales of reserves in place
  
—

 
—

 
—

 
—

Production
  
(283
)
 
(14,570
)
 
(300
)
 
(18,068
)
September 30, 2013
  
3,424

 
322,418

 
5,730

 
377,342


(1)
Purchases of reserves in place include the initial contribution of conventional assets from EXCO as of February 14, 2013, and the acquisition of shallow Cotton Valley assets from an affiliate of BG Group as of March 5, 2013.
(2)
New discoveries and extensions were a result of the EXCO/HGI JV’s development in the Permian basin.
(3)
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 the EXCO/HGI JV’s 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 recent performance.

Estimated Quantities of Proved Developed and Undeveloped Reserves
 
  
Oil
 (Mbbls)
 
Natural
 Gas
 (Mmcf)
  
Natural Gas Liquids (Mbbls)
 
Mmcfe
Proved developed:
  
 
 
 
  
 
 
 
September 30, 2013
  
3,107

 
317,748

 
4,799

 
365,185

Proved undeveloped:
  
 
 
 
  
 
 
 
September 30, 2013
  
317

 
4,670

 
931

 
12,157
Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure
 
  
Amount
September 30, 2013
 
 
Future cash inflows
 
$
1,638.5

Future production costs
 
923.7

Future development costs
 
156.0

Future income taxes
 
39.3

Future net cash flows
 
519.5

Discount of future net cash flows at 10% per annum
 
217.2

Standardized measure of discounted future net cash flows
 
$
302.3
Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows
The following are the principal sources of change in the Standardized Measure:
 
  
Amount
Period from inception to September 30, 2013:
 
 
Sales and transfers of oil and natural gas produced
 
$
(46.2
)
Net changes in prices and production costs
 
39.2

Extensions and discoveries, net of future development and production costs
 
8.1

Development costs during the period
 
7.4

Changes in estimated future development costs
 
20.2

Revisions of previous quantity estimates
 
(50.2
)
Sales of reserves in place
 
—

Purchase of reserves in place
 
300.6

Accretion of discount before income taxes
 
16.1

Changes in timing and other
 
27.9

Net change in income taxes
 
(20.8
)
Net change
 
$
302.3
Schedule of Capitalized Costs of Unproved Properties Excluded from Amortization
The following table summarizes the categories of costs comprising the amount of unproved properties not subject to amortization by the period in which such costs were incurred. There are no individually significant properties or significant development projects included in costs not being amortized. The majority of the evaluation activities are expected to be completed within one to four years.  
 
 
Amount
Period from inception to September 30, 2013:
 
 
Property acquisition costs
 
$
35.7

Exploration and development
 
—

Capitalized interest
 
0.8

Total
 
$
36.5