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, $ in Thousands
 9 Months Ended 12 Months Ended
Mar. 31, 2014
AUD
Mar. 31, 2014
AUD
Jan. 14, 2013
shares
Mar. 31, 2014
AUD
AUD / Gigajoule
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Amount paid in exchange for assets | $         $ 0 $ 18,554
Shares issued during period for acquisitions | shares     543,478      
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%    
Central Petroleum Limited            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ownership percentage         11.00%  
Central Petroleum Limited | Amadeus Basin            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ownership percentage         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   AUD 7,000