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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, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of net productive wells and dry wells drilled [line items] |  |  |
Net exploratory wells, Productive | 5 | 1 | 3
Net exploratory wells, Dry | 2 | 1 | 2
Net exploratory wells, Total | 7 | 2 | 5
Net development wells, Productive | 34 | 85 | 81
Net development wells, Dry |  | 1 |
Net development wells, Total | 34 | 86 | 81
Total | 41 | 88 | 86
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 | 1 |
Net exploratory wells, Dry |  | 1 |
Net exploratory wells, Total | 1 | 2 |
Net development wells, Productive | 33 | 84 | 80
Net development wells, Dry |  | 1 |
Net development wells, Total | 33 | 85 | 80
Total | 34 | 87 | 80
Other countries [member] |  |  |
Disclosure of net productive wells and dry wells drilled [line items] |  |  |
Net exploratory wells, Productive | 4 |  | 3
Net exploratory wells, Dry | 2 |  | 2
Net exploratory wells, Total | 6 |  | 5
Net development wells, Productive |  |  | 1
Net development wells, Total |  |  | 1
Total | 6 |  | 6

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