Annual report pursuant to Section 13 and 15(d)

Basis of Presentation - Goodwill Roll-Forward (Details)

v2.4.0.6
Basis of Presentation - Goodwill Roll-Forward (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jun. 30, 2012
reporting_unit
Jun. 30, 2012
Magellan Petroleum Australia Limited (MPAL)
Jun. 30, 2011
Magellan Petroleum Australia Limited (MPAL)
Jun. 30, 2012
Nautilus Poplar, LLC (NP)
Jun. 30, 2011
Nautilus Poplar, LLC (NP)
Goodwill [Line Items]          
Goodwill, Number of Reporting Units 2        
Goodwill [Roll Forward]          
Fiscal year ended June 30, 2011 $ 4,695 $ 1,500 $ 4,000 $ 700 $ 700
Fiscal year ended June 30, 2012 $ 2,174 $ 1,500 $ 4,000 $ 700 $ 700