Quarterly report pursuant to Section 13 or 15(d)

Sale of Amadeus Basin Assets (Details)

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Sale of Amadeus Basin Assets (Details)
 3 Months Ended
Mar. 31, 2014
AUD
shares
Sep. 30, 2015
AUD
AUD / Gigajoule
Central Petroleum Limited    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Ownership percentage 11.00% 7.50%
Amadeus Basin    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Amount paid in exchange for assets AUD 20,000,000  
Customary purchase price adjustments AUD 800,000  
Discount rate   10.00%
Amadeus Basin | Maximum    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Bonus discharge amount   AUD 7,000,000.0
Amadeus Basin | Palm Valley    
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, following 5 years   10 years
Royalty rate term, first 10 years   5 years
Amadeus Basin | Central Petroleum Limited    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Shares issued during period for acquisitions | shares 39,500,000.0