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Supplemental Information Relating to Oil and Natural Gas Producing Activities (Unaudited) - Costs Incurred in Oil and Gas Property Acquisiton, Exploration, and Development (Details) (Compass, USD $) In Millions, unless otherwise specified | 7 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2014
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |
Proved property acquisition costs | $ 569.5 | $ 0
Unproved property acquisition costs | 53.9 | 0
Total property acquisition costs | 623.4 | 0
Development | 11.8 | 11.4
Lease acquisitions and other | 0 | 0.2
Capitalized asset retirement costs | $ 0.1 | $ 0.1
Depreciation, depletion and amortization per unit | 1.67 | 1.45
East Texas/North Louisiana |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates (Energy), Other Factors | 7,500,000,000.0 | 11.5

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- Definition Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates (Energy), Other Factors + References No definition available. + Details
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- Definition Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62038-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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