|
Segment and Geographical Data (Details) (USD $)
In Thousands, 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
subsidiary
|
Jun. 30, 2011
|
Jun. 30, 2010
|
|
| Segment Reporting Information [Line Items] | |||||||||||
| Number of wholly owned subsidiaries | 2 | ||||||||||
| 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 |
| Net income (loss) | 34,705 | (4,590) | (4,557) | 940 | (26,873) | (84) | (2,099) | (3,376) | 26,498 | (32,432) | (1,446) |
| Assets | 92,574 | 71,574 | 92,574 | 71,574 | 90,706 | ||||||
| Expenditures for additions to long-lived assets | (9,577) | (4,568) | (2,843) | ||||||||
| Depletion, depreciation, amortization, and accretion | 1,744 | 2,890 | 5,428 | ||||||||
| Lease operating | 12,897 | 9,247 | 10,116 | ||||||||
| Exploration | 6,291 | 2,854 | 1,273 | ||||||||
| Income tax benefit (expense) | 5,951 | (5,141) | (2,646) | ||||||||
|
Nautilus Poplar, LLC (NP)
|
|||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Total operating revenues | 6,173 | 3,804 | 2,291 | ||||||||
| Net income (loss) | 2,154 | (23) | (55) | ||||||||
| Assets | 10,833 | 16,985 | 10,833 | 16,985 | 5,427 | ||||||
| Expenditures for additions to long-lived assets | (4,857) | (2,095) | (328) | ||||||||
| Depletion, depreciation, amortization, and accretion | 819 | 919 | 448 | ||||||||
| Lease operating | 5,232 | 2,227 | 1,373 | ||||||||
| Exploration | 1,495 | 151 | 0 | ||||||||
|
Magellan Petroleum Australia Limited (MPAL)
|
|||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Total operating revenues | 7,533 | 12,775 | 25,908 | ||||||||
| Net income (loss) | 24,192 | (25,968) | 7,569 | ||||||||
| Assets | 67,748 | 49,291 | 67,748 | 49,291 | 63,131 | ||||||
| Expenditures for additions to long-lived assets | (4,575) | (1,679) | (2,209) | ||||||||
| Depletion, depreciation, amortization, and accretion | 695 | 1,653 | 4,834 | ||||||||
| Lease operating | 7,665 | 6,270 | 8,585 | ||||||||
| Exploration | 4,796 | 2,378 | 1,273 | ||||||||
| Income tax benefit (expense) | 5,951 | (5,463) | (2,076) | ||||||||
|
Corporate
|
|||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Total operating revenues | 646 | 2,722 | 2,826 | ||||||||
| Net income (loss) | (5,416) | (6,429) | (263) | ||||||||
| Assets | 59,099 | 83,323 | 59,099 | 83,323 | 90,345 | ||||||
| Expenditures for additions to long-lived assets | (145) | (794) | (306) | ||||||||
| Depletion, depreciation, amortization, and accretion | 230 | 318 | 146 | ||||||||
| Lease operating | 0 | 750 | 158 | ||||||||
| Exploration | 0 | 325 | 0 | ||||||||
| Income tax benefit (expense) | 0 | 322 | (570) | ||||||||
|
Inter-segment Elimination
|
|||||||||||
| Segment Reporting Information [Line Items] | |||||||||||
| Total operating revenues | (640) | (1,125) | (2,500) | ||||||||
| Net income (loss) | 5,568 | (12) | (8,697) | ||||||||
| Assets | $ (45,106) | $ (78,025) | $ (45,106) | $ (78,025) | $ (68,197) | ||||||