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Supplemental Information Relating to Oil and Natural Gas Producing Activities (Unaudited) - Schedule of Capitalized Costs of Unproved Properties Excluded from Amortization (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
EXCO/HGI JV
  
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]  
Property acquisition costs $ 35.7
Exploration and development 0
Capitalized interest 0.8
Total $ 36.5
Minimum
  
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]  
Anticipated Timing of Inclusion of Costs in Amortization Calculation P1Y
Maximum
  
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]  
Anticipated Timing of Inclusion of Costs in Amortization Calculation P4Y