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Number of Crude Oil and Natural Gas Wells Drilled and Completed (Detail) - Wells
 12 Months Ended
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