Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Jun. 30, 2012
Sep. 17, 2012
Dec. 30, 2011
Document Information [Line Items]      
Document Type 10-K    
Document Period End Date Jun. 30, 2012    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2012    
Current Fiscal Year End Date --06-30    
Entity Central Index Key 0000061398    
Entity Current Reporting Status Yes    
Entity Filer Category Smaller Reporting Company    
Entity Registrant Name MAGELLAN PETROLEUM CORP /DE/    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer Yes    
Entity Common Stock Shares Outstanding   53,885,594  
Entity Public Float     $ 41,241,284