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Acquisitions - Other insignficant acquisitions (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Business Acquisition [Line Items]
Estimated Income tax rate	21.00%	35.00%
Oil and natural gas properties
Goodwill (Note 12)	$ 2,276.4		$ 2,277.1
Minimum [Member] | Customer Relationships [Member]
Oil and natural gas properties
Amortization period, intangible asset	2 years
Maximum | Customer Relationships [Member]
Oil and natural gas properties
Amortization period, intangible asset	20 years

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- Definition

Oil and Natural Gas Properties [Abstract]

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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
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
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