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Number of Crude Oil and Natural Gas Wells Drilled and Completed (Parenthetical) (Detail) - Wells	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Disclosure of net productive wells and dry wells drilled [Line Items]
Net development wells, Productive	85	81	140
Net development wells, Dry	1		2
United States [member]
Disclosure of net productive wells and dry wells drilled [Line Items]
Net development wells, Productive	84	80	137
Net development wells, Dry	1		2
United States [member] | Discontinued Operations - Onshore US Cash Generating Units [Member]
Disclosure of net productive wells and dry wells drilled [Line Items]
Net development wells, Productive	84	79	135
Net development wells, Dry	1		2

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- Definition

Disclosure of net productive wells and dry wells drilled during the period.

+ References

No definition available.

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- Definition

The number of nonproductive development wells (dry wells) drilled in the geographic area. A dry well (hole) is a well found to be incapable of producing either oil or gas in sufficient quantities to justify completion as an oil or gas well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1205
-Paragraph (a)
-Subparagraph (2)

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- Definition

The number of productive developmental wells drilled in the geographic area. A productive well is a well that is not a dry well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1205
-Paragraph (a)
-Subparagraph (2)

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