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Number of Crude Oil and Natural Gas Wells Drilled and Completed (Detail) - Wells | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of net productive wells and dry wells drilled [line items] |  |  |
Net exploratory wells, Productive |  | 1 | 5
Net exploratory wells, Dry | 1 | 1 | 2
Net exploratory wells, Total | 1 | 2 | 7
Net development wells, Productive | 3 | 1 | 34
Net development wells, Dry |  | 1 |
Net development wells, Total | 3 | 2 | 34
Total | 4 | 4 | 41
Australia [member] |  |  |
Disclosure of net productive wells and dry wells drilled [line items] |  |  |
Net development wells, Productive | 1 |  | 1
Net development wells, Total | 1 |  | 1
Total | 1 |  | 1
United States [member] |  |  |
Disclosure of net productive wells and dry wells drilled [line items] |  |  |
Net exploratory wells, Productive |  |  | 1
Net exploratory wells, Total |  |  | 1
Net development wells, Productive | 1 |  | 33
Net development wells, Dry |  | 1 |
Net development wells, Total | 1 | 1 | 33
Total | 1 | 1 | 34
Other countries [member] |  |  |
Disclosure of net productive wells and dry wells drilled [line items] |  |  |
Net exploratory wells, Productive |  | 1 | 4
Net exploratory wells, Dry | 1 | 1 | 2
Net exploratory wells, Total | 1 | 2 | 6
Net development wells, Productive | 1 | 1 |
Net development wells, Total | 1 | 1 |
Total | 2 | 3 | 6

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- Definition Number of development oil and gas wells incapable of producing either oil or gas in sufficient quantity to justify completion as oil or gas well. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1205 -Paragraph (a) -Subparagraph (2) + Details
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