Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Details)

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Quarterly Financial Data (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
Selected Quarterly Financial Information [Abstract]                      
Total operating revenues $ 1,970 $ 4,805 $ 3,202 $ 3,735 $ 5,149 $ 4,867 $ 4,461 $ 3,699 $ 13,712 $ 18,176 $ 28,525
Total operating expenses (income) (26,388) 9,367 8,076 2,883 25,632 4,947 8,158 7,658 (6,062) 46,395 26,073
Income (loss) before income tax 28,754 (4,590) (4,755) 1,123 (20,218) 111 (3,476) (3,713) 20,532 (27,296) 1,189
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
                     
Selected Quarterly Financial Information [Abstract]                      
Gain on sale of assets                 $ 36,166