Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accounts Receivable

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Accrued Liabilites

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Current

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Noncurrent

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities

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- Definition

Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Oil And Natural Gas Properties

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Prepaid Expenses and Other

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Proved Developed and Undeveloped Oil and Natural Gas Properties

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Unproved Oil and Natural Gas Properties

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- Definition

This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

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- Definition

The amount of financial assets (as defined) recognized as of the acquisition date.

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- Definition

The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date.

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

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- Definition

The amount of inventory recognized as of the acquisition date.

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- Definition

The net amount recognized as of the acquisition date for the aggregate identifiable assets acquired in excess of or less than the aggregate liabilities assumed.

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- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

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- Definition

The net amount recognized as of the acquisition date for the aggregate assets, including goodwill, in excess of or less than the aggregate liabilities assumed, less the noncontrolling interest in the acquiree. This amount represents the recognized net assets acquired which are attributable to the parent which may also be viewed as the incremental amount of equity attributable to the parent resulting from the business combination.

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- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Acquisitions - Summary of Amounts Recorded in Connection with Acquisition of Business (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012	Feb. 14, 2013 EXCO/HGI Partnership [Member] HGI [Member]	Feb. 14, 2013 EXCO/HGI Partnership [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 Partnership [Member]	Mar. 31, 2013 HHI Business [Member]	Dec. 17, 2012 HHI Business [Member]	Dec. 17, 2012 HHI Business [Member] Business Combination Measurement Period Adjustment [Member]	Mar. 31, 2013 Shaser Biosciences, Inc. [Member]	Nov. 08, 2012 Shaser Biosciences, Inc. [Member]	Mar. 31, 2013 Shaser Biosciences, Inc. [Member] Business Combination Measurement Period Adjustment [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash			$ 0.1	$ 0.1		$ 0	$ 0	$ 23.2	$ 17.4	$ 5.8	$ 0.9	$ 0.9	$ 0
Accounts receivable								109.0	104.6	4.4
Inventory								204.7	207.1	(2.4)
Prepaid expenses and other								9.2	13.3	(4.1)
Property, plant and equipment								99.3	104.5	(5.2)
Intangible asset								470.0	470.0	0	32.8	35.5	(2.7)
Other long-term assets			32.7	24.5		0	0	3.1	3.1	0	2.7	2.7	0
Total assets acquired								918.5	920.0	(1.5)	36.4	39.1	(2.7)
Oil and natural gas properties
Unproved oil and natural gas properties			65.1	48.5		7.2	5.4
Proved developed and undeveloped oil and natural gas properties			632.2	471.0		131.2	97.7
Total oil and natural gas properties			697.3	519.5		138.4	103.1
Accounts payable								138.1	130.1	8.0
Deferred tax liability - current								7.1	7.1	0
Accrued liabilities			(14.1)	(10.5)		0	0	(36.9)	(37.5)	0.6
Deferred tax liability - long-term								115.9	104.7	11.2
Other long-term liabilities			(23.5)	(17.5)		(7.5)	(5.6)	(9.0)	(11.2)	2.2
Total liabilities assumed								307.0	290.6	16.4	13.4	14.4	(1.0)
Total identifiable net assets			692.5	516.1	130.9	130.9	97.5	611.5	629.4	(17.9)	23.0	24.7	(1.7)
Non-controlling interests								(4.4)	(2.2)	(2.2)	(39.0)	(39.0)	0
Goodwill	1,434.0	694.2						682.3	662.2	20.1	65.6	63.9	1.7
Total net assets acquired								$ 1,289.4	$ 1,289.4	$ 0	$ 49.6	$ 49.6	$ 0