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Acquisitions - Other insignficant acquisitions (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |
Estimated Income tax rate | 21.00% | 35.00%
Oil and natural gas properties |  |
Goodwill (Note 12) | $ 2,280.2 | $ 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 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=65882285&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=65882285&loc=d3e32698-109319 + Details
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