Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Divestitures (Purchase Price Allocation and Other Disclosures) (Details)

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Acquisitions and Divestitures (Purchase Price Allocation and Other Disclosures) (Details) (Santos Sales Agreement)
 9 Months Ended 12 Months Ended
Mar. 31, 2013
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2012
AUD
Mar. 31, 2013
Mereenie Operating Joint Venture
May 25, 2012
Palm Valley Joint Venture
May 25, 2012
Dingo Joint Venture
Disposal Group, Other Information [Abstract]            
Ownership Interest Sold       35.00%    
Joint Venture, Ownership Interest Sold by Third Party         48.00% 66.00%
Other Payments to Acquire Businesses     17,500,000      
Goodwill, Written off Related to Sale of Business Unit   2,500,000        
Disposal Group, Cost of Disposed Entity [Abstract]            
Consideration received, net purchase price per Santos SA 25,493,000          
Consideration received, purchase price adjustments 1,138,000          
Consideration received total 26,631,000          
Disposal Group, Consideration Received Allocation [Abstract]            
Allocation of the consideration received, proved oil and gas properties (Palm Valley) 3,403,000          
Allocation of the consideration received, unproved oil and gas properties (Dingo) 2,957,000          
Allocation of the consideration received, land, buildings, and equipment (Palm Valley) 370,000          
Total allocation of the fair value received 6,730,000          
Mereenie liabilities given up, net 2,805,000          
Gain on sale of assets $ 36,166,000