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Significant Accounting Policies and Practices and Recent Accounting Pronouncements - Proven and Unproven Oil and Gas Properties (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Reserve Quantities [Line Items]
Impairment of proved oil and natural gas properties	$ 485.1	$ 81.0	$ 54.3
Property, Plant and Equipment, Estimated Useful Lives	14 years
Compass Production Partners [Member]
Reserve Quantities [Line Items]
Impairment of Unproved Oil and Gas Properties	$ 21.9	6.1	$ 10.3
Unproved Oil and Natural Gas Properties and Development Costs Not Being Amortized | Compass
Reserve Quantities [Line Items]
Capitalized Costs, Unproved Properties		$ 20.2

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- Definition

Impairment of Proved Oil and Gas Properties

+ References

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- Definition

Impairment of Unproved Oil and Gas Properties

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- Definition

Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Properties



-URI http://asc.fasb.org/extlink&oid=21914647



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 932



-SubTopic 235



-Section 50



-Paragraph 13



-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61901-109447



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 932



-Glossary Unproved Properties



-URI http://asc.fasb.org/extlink&oid=6527831

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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