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Discontinued Operations - Summary of Significant Joint Operations in Classified as Assets and Liabilities Held for Sale (Detail) | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Eagle Ford United States [member] |  |
Disclosure of discontinued operations [line items] |  |
Country of operation | US |
Principal activity | Hydrocarbons exploration and production |
Eagle Ford United States [member] | Bottom of range [Member] |  |
Disclosure of discontinued operations [line items] |  |
Group interest | <1 | <1
Eagle Ford United States [member] | Top of range [Member] |  |
Disclosure of discontinued operations [line items] |  |
Group interest | 100.00% | 100.00%
Fayetteville United States [member] |  |
Disclosure of discontinued operations [line items] |  |
Country of operation | US |
Principal activity | Hydrocarbons exploration and production |
Fayetteville United States [member] | Bottom of range [Member] |  |
Disclosure of discontinued operations [line items] |  |
Group interest | <1 | <1
Fayetteville United States [member] | Top of range [Member] |  |
Disclosure of discontinued operations [line items] |  |
Group interest | 100.00% | 100.00%
Haynesville United States [member] |  |
Disclosure of discontinued operations [line items] |  |
Country of operation | US |
Principal activity | Hydrocarbons exploration and production |
Haynesville United States [member] | Bottom of range [Member] |  |
Disclosure of discontinued operations [line items] |  |
Group interest | <1 | <1
Haynesville United States [member] | Top of range [Member] |  |
Disclosure of discontinued operations [line items] |  |
Group interest | 100.00% | 100.00%
Premian United States [member] |  |
Disclosure of discontinued operations [line items] |  |
Country of operation | US |
Principal activity | Hydrocarbons exploration and production |
Premian United States [member] | Bottom of range [Member] |  |
Disclosure of discontinued operations [line items] |  |
Group interest | <1 | <1
Premian United States [member] | Top of range [Member] |  |
Disclosure of discontinued operations [line items] |  |
Group interest | 100.00% | 100.00%

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- Definition The description of the nature of the entity's operations and principal activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 138 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_138_b&doctype=Standard -URIDate 2017-03-09 + Details
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