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Subsequent Events - Additional Information (Detail) (USD $) | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2012 Debt financing [Member] | Nov. 08, 2012 Subsequent Event [Member] | Nov. 16, 2012 6.375% Senior Notes due 2020 [Member] Subsequent Event [Member] | Nov. 16, 2012 6.625% Senior Notes due 2022 [Member] Subsequent Event [Member] | Sep. 30, 2012 EXCO [Member] | Sep. 30, 2012 HGI [Member] | Sep. 30, 2012 HGI and EXCO [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition agreement date | Oct. 08, 2012 |  |  |  |  |  |  |  |  |
HHI Business Contracted Purchase Price | $ 1,400,000,000 |  |  |  |  |  |  |  |  |
Termination fee | 78,000,000 |  |  |  |  |  |  |  |  |
Senior Notes, aggregate principal amount |  |  |  |  |  | 520,000,000 | 570,000,000 |  |  |
Senior Notes, interest rate |  |  |  |  |  | 6.375% | 6.625% |  |  |
Senior Notes, maturity date |  |  |  |  |  | 2020 | 2022 |  |  |
Debt financing commitments |  |  |  | 1,840,000,000 |  |  |  |  |  |
Cash acquisition | 185,067,000 | (684,417,000) | 2,577,000 |  | 50,000,000 |  |  |  |  |
Business acquisition, percentage of equity interests acquired |  |  |  |  | 56.00% |  |  |  |  |
Total consideration to purchase and operate production of oil and Gas |  |  |  |  |  |  |  | 725,000,000 |  |
Acquisition of oil and gas assets |  |  |  |  |  |  |  | 725,000,000 |  |
Acquisition of oil and gas assets through bank debts | 225,000,000 |  |  |  |  |  |  |  |  |
Acquisition of oil and gas assets through cash |  |  |  |  |  |  |  |  | 372,500,000,000 |
Acquisition of oil and gas assets through oil and gas properties and related assets |  |  |  |  |  |  |  | 127,500,000 |  |
Receipt of limited partnership interest |  |  |  |  |  |  |  |  | 75.00% |
Receipt of interest in the general partner of partnership | 50.00% |  |  |  |  |  |  |  |  |
Own interest in partnership |  |  |  |  |  |  |  |  | 2.00% |
Total equity interest in partnership |  |  |  |  |  |  |  |  | 74.50% |
Cash proceeds from limited partner interest |  |  |  |  |  |  |  | $ 597,500,000,000 |  |
Cash proceeds percentage from limited partner interest |  |  |  |  |  |  |  | 25.00% |  |
Cash proceeds percentage from member interest |  |  |  |  |  |  |  |  |  | 50.00%
Percentage of equity interest in partnership |  |  |  |  |  |  |  | 25.50% |  |
Percentage of member interest in general partner |  |  |  |  |  |  |  |  |  | 50.00%

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- Definition The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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