Annual report pursuant to Section 13 and 15(d)

Sale of Amadeus Basin Assets (Details)

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Sale of Amadeus Basin Assets (Details)
AUD in Thousands, shares in Millions, $ in Millions
12 Months Ended
May 18, 2016
USD ($)
May 18, 2016
AUD
Mar. 31, 2014
AUD
shares
Mar. 31, 2014
AUD
shares
Jun. 30, 2014
AUD / Gigajoule
Jun. 30, 2016
Amadeus Basin            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Amount paid in exchange for assets       AUD 20,000    
Customary purchase price adjustments     AUD 800      
Discount rate         10.00%  
Mereenie Bonus            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Amount paid in exchange for assets $ 2.5 AUD 3,500        
Central Petroleum Limited            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ownership percentage           1.90%
Central Petroleum Limited | Amadeus Basin            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Investment owned (in shares) | shares     39.5 39.5    
Ownership percentage     11.00% 11.00%    
Palm Valley | Amadeus Basin            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Royalty rate         25.00%  
AUD/Gigajoule gas price trigger for first ten years | AUD / Gigajoule         5.00  
AUD/Gigajoule gas price trigger for following five years | AUD / Gigajoule         6.00  
Royalty rate term, first 10 years         10 years  
Royalty rate term, following 5 years         5 years  
Maximum | Amadeus Basin            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Bonus discharge amount     AUD 7,000 AUD 7,000