XML 188 R207.htm IDEA: XBRL DOCUMENT v3.20.2
Number of Crude Oil and Natural Gas Wells Drilled and Completed (Detail) - Wells
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of net productive wells and dry wells drilled [line items]      
Net exploratory wells, Productive 1 5 1
Net exploratory wells, Dry 1 2 1
Net exploratory wells, Total 2 7 2
Net development wells, Productive 1 34 85
Net development wells, Dry 1   1
Net development wells, Total 2 34 86
Total 4 41 88
Australia [member]      
Disclosure of net productive wells and dry wells drilled [line items]      
Net exploratory wells, Productive 0    
Net exploratory wells, Dry 0    
Net exploratory wells, Total 0    
Net development wells, Productive 0 1 1
Net development wells, Dry 0    
Net development wells, Total 0 1 1
Total 0 1 1
United States [member]      
Disclosure of net productive wells and dry wells drilled [line items]      
Net exploratory wells, Productive 0 1 1
Net exploratory wells, Dry 0   1
Net exploratory wells, Total 0 1 2
Net development wells, Productive 0 33 84
Net development wells, Dry 1   1
Net development wells, Total 1 33 85
Total 1 34 87
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 2  
Net exploratory wells, Total 2 6  
Net development wells, Productive 1    
Net development wells, Dry 0    
Net development wells, Total 1    
Total 3 6