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Acquisitions - Additional Information (Detail) (USD $) | 9 Months Ended |  | 9 Months Ended | 0 Months Ended |  | 0 Months Ended |  |  | 0 Months Ended |  |  |  | 0 Months Ended |
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Jun. 30, 2013 | Jul. 01, 2012 | Sep. 30, 2012 | Jun. 30, 2013 Minimum [Member] | Jun. 30, 2013 Maximum [Member] | Jun. 30, 2013 VOBA [Member] | Jun. 30, 2013 Technology assets [Member] Minimum [Member] | Jun. 30, 2013 Technology assets [Member] Maximum [Member] | Jun. 30, 2013 Customer relationships [Member] Minimum [Member] | Jun. 30, 2013 Customer relationships [Member] Maximum [Member] | Dec. 17, 2012 HHI Business [Member] | Jun. 30, 2013 HHI Business [Member] | Dec. 17, 2012 HHI Business [Member] Technology assets [Member] | Dec. 17, 2012 HHI Business [Member] Technology assets [Member] Minimum [Member] | Dec. 17, 2012 HHI Business [Member] Technology assets [Member] Maximum [Member] | Dec. 17, 2012 HHI Business [Member] Trade name license agreement [Member] | Dec. 17, 2012 HHI Business [Member] Trade name license agreement [Member] Minimum [Member] | Dec. 17, 2012 HHI Business [Member] Trade name license agreement [Member] Maximum [Member] | Dec. 17, 2012 HHI Business [Member] Trade name [Member] | Dec. 17, 2012 HHI Business [Member] Trade name [Member] Minimum [Member] | Dec. 17, 2012 HHI Business [Member] Trade name [Member] Maximum [Member] | Dec. 17, 2012 HHI Business [Member] Customer relationships [Member] | Dec. 17, 2012 HHI Business [Member] Trademarks and trade names [Member] | Dec. 17, 2012 HHI Business [Member] Trademarks and trade names [Member] Minimum [Member] | Dec. 17, 2012 HHI Business [Member] Trademarks and trade names [Member] Maximum [Member] | Jun. 30, 2013 Shaser Biosciences, Inc. [Member] | Nov. 08, 2012 Shaser Biosciences, Inc. [Member] | Nov. 08, 2012 Shaser Biosciences, Inc. [Member] Non-controlling Interest [Member] | Nov. 08, 2012 Shaser Biosciences, Inc. [Member] Technology assets [Member] | Nov. 08, 2012 Shaser Biosciences, Inc. [Member] Call Option exercisable between January 1, 2017 and March 31, 2017 [Member] | Jun. 30, 2013 Shaser Biosciences, Inc. [Member] Business Combination Measurement Period Adjustment [Member] | Feb. 14, 2013 EXCO/HGI JV [Member] EXCO [Member] | Feb. 14, 2013 EXCO/HGI JV [Member] HGI [Member] | Feb. 14, 2013 EXCO/HGI JV [Member] HGI Energy Holdings, LLC [Member] | Feb. 14, 2013 EXCO/HGI JV [Member] EXCO/HGI General Partner [Member] | Feb. 14, 2013 EXCO/HGI JV [Member] | Mar. 05, 2013 Cotton-Valley Oil and Gas Properties [Member] | Mar. 05, 2013 Cotton-Valley Oil and Gas Properties [Member] HGI [Member] | Mar. 05, 2013 Cotton-Valley Oil and Gas Properties [Member] EXCO/HGI JV [Member] | Apr. 06, 2011 FGL [Member] | Jun. 30, 2013 FGL [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 1,470,200,000 |  | $ 694,200,000 |  |  |  |  |  |  |  | $ 662,100,000 | $ 720,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65,600,000 | $ 63,900,000 |  |  |  | $ 1,700,000 |  |  |  |  |  |  |  |  |  |
Deferred tax liability - long-term |  |  |  |  |  |  |  |  |  |  | 104,700,000 | 117,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  | 104,500,000 | 136,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory |  |  |  |  |  |  |  |  |  |  | 207,200,000 | 205,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory adjustment to fair value |  |  |  |  |  |  |  |  |  |  | 31,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net adjustment to fair value |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset |  |  |  |  |  |  |  |  |  |  | 470,000,000 | 487,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,800,000 | 35,500,000 |  |  |  | (2,700,000) |  |  |  |  |  |  |  |  |  |
Estimated sales growth rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% | 31.00% |  | 2.50% | 5.00% |  | 2.50% | 5.00% | 3.00% |  | 2.50% | 5.00% |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Customer retention rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Income tax rate | 35.00% |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  | 35.00% |  |  | 35.00% |  |  | 35.00% | 35.00% |  |  |  |  | 35.00% | 35.00% |  |  |  |  |  |  |  |  |  |  |  |
Discounted rate |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  | 12.00% |  |  | 12.00% |  |  | 12.00% | 12.00% |  |  |  |  | 12.00% | 11.00% |  |  |  |  |  |  |  |  |  |  |  |
Carrying value, intangible asset |  |  |  |  |  |  |  |  |  |  |  |  | 51,000,000 |  |  | 12,000,000 |  |  | 4,100,000 |  |  | 90,000,000 | 330,000,000 |  |  |  |  |  | 32,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Amortization period, intangible asset |  |  |  | 1 year | 20 years | 4 years 10 months 24 days | 4 years | 17 years | 15 years | 20 years |  |  |  |  |  | 5 years |  |  | 8 years |  |  | 20 years |  |  |  |  |  |  | 13 years |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 5.00% | 4.00% |  |  | 3.50% |  |  |  |  | 3.00% | 5.00% |  |  |  | 10.50% |  |  |  |  |  |  |  |  |  |  |  |
Expected terminal year growth rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining legal life |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities, net |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Percentage Of Equity Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56.00% |  |  | 44.00% |  | 24.50% | 74.50% | 73.50% | 2.00% |  |  |  |  |  |
Business Combination Purchase Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 725,000,000 | 349,800,000 |  |  | 574,800,000 |  |  |  |  |
Trailing revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Adjusted trailing EBITDA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700.00% |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest |  |  |  |  |  |  |  |  |  |  | 2,200,000 | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,000,000 | 39,000,000 | 39,000,000 |  |  | 0 | 119,100,000 |  |  |  |  |  |  |  |  |
Preliminary working capital and other adjustments |  |  |  |  |  |  |  |  |  |  | (10,700,000) | (7,700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (400,000) |  |  |  |  |  | 30,500,000 |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  | 629,500,000 | 658,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,000,000 | 24,700,000 |  |  |  | (1,700,000) |  | 694,500,000 |  |  | 517,600,000 | 130,900,000 | 130,900,000 | 97,500,000 |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Oil And Natural Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 697,300,000 |  |  | 519,500,000 |  | 138,400,000 | 103,100,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Gas Gathering Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,500,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,500,000 |  |  | 5,600,000 |  |
Cash consideration | 2,013,700,000 | 185,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000,000 |
Cash consideration re-characterized as expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |
Reduction in purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |
Insurance obligations under annuity contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000,000 |
Maximum amount of asset securing reinsurance obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |
Maximum amount required to pay under Front Street Reinsurance Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |
Fair value assigned to the contingent purchase price reduction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Business Combination, Contingent Consideration, Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,000,000

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Obligation + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Gas Gathering Assets + References No definition available. + Details
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- Definition Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Oil And Natural Gas Properties + References No definition available. + Details
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- Definition The aggregate expected value at the end of their useful life of a major finite-lived intangible asset class acquired during the period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of asset recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6411-128476 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to inventory acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1500-128463 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to property, plant, and equipment acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1500-128463 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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