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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)
$ in Millions
 8 Months Ended 12 Months Ended
Sep. 30, 2013
USD ($)
$ / bbl
Sep. 30, 2015
USD ($)
$ / bbl
Sep. 30, 2014
USD ($)
$ / bbl
Compass      
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]      
Property acquisition costs   $ 18.9  
Acquisition Costs, Period Cost $ 18.9 0.0 $ 0.0
Capitalized interest   1.3  
Capitalized Interest Excluded from Amortization, Period Costs 0.6 0.0 0.7
Total   20.2  
Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost $ 19.5 $ 0.0 $ 0.7
Minimum [Member]      
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
Natural Gas Liquids      
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]      
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Reference Price | $ / bbl 38.64 21.50 43.58