Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures - Pro Forma Disclosure (Details)

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Acquisitions and Divestitures - Pro Forma Disclosure (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Magellan as Reported                      
Sales $ 1,970 $ 4,805 $ 3,202 $ 3,735 $ 5,149 $ 4,867 $ 4,461 $ 3,699 $ 13,712 $ 18,176 $ 28,525
Net income (loss) attributable to Magellan Petroleum Corporation 34,705 (4,590) (4,557) 940 (26,873) (84) (2,099) (3,376) 26,498 (32,432) (1,446)
Net income (loss) per basic share outstanding (dollars per share) $ 0.64 $ (0.09) $ (0.08) $ 0.02 $ (0.51)   $ (0.04) $ (0.06) $ 0.49 $ (0.62) $ (0.03)
Net income (loss) per diluted share outstanding (dollars per share) $ 0.64 $ (0.09) $ (0.08) $ 0.02 $ (0.51)   $ (0.04) $ (0.06) $ 0.49 $ (0.62) $ (0.03)
Santos Sales Agreement
                      
Pro Forma Acquisition                      
Pro Forma Acquisition, Sales                 1,025 [1] 4,492 [1]  
Pro Forma Acquisition, Net income (loss) attributable to Magellan Petroleum Corporation                 (223) [1] 2,471 [1]  
Pro Forma Disposition                      
Pro Forma Disposition, Sales                 (5,891) [2] (8,813) [2]  
Pro Forma Disposition, Net income (loss) attributable to Magellan Petroleum Corporation                 835 [2] (1,144) [2]  
Pro Forma Combined                      
Pro Forma Combined, Sales                 8,846 13,855  
Pro Forma Combined, Net income (loss) attributable to Magellan Petroleum Corporation                 $ 27,110 $ (31,105)  
Pro Forma Combined, Net income per basic share outstanding                 $ 0.51 $ (0.59)  
Pro Forma Combined, Net income per diluted share outstanding                 $ 0.50 $ (0.59)  
[1] Reflects the pro forma results from operations related to the Palm Valley Interests and the Dingo Interests.
[2] Reflects the pro forma results from operations related to the Mereenie Interests.