Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Information - Proved Reserves Quantities (Details)

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Supplemental Oil and Gas Information - Proved Reserves Quantities (Details)
 12 Months Ended
Jun. 30, 2013
bbl
Jun. 30, 2012
bbl
Proved Developed and Undeveloped Reserves [Abstract]    
Number of PUD wells removed from projections 4  
Number of drilling rigs utillized in PUD programs 1  
Previously forecasted
    
Proved Developed and Undeveloped Reserves [Abstract]    
Number of drilling rigs utillized in PUD programs 2  
Oil (in Mbbls)
    
Proved Developed and Undeveloped Reserves [Abstract]    
Proved Reserves, Beginning Balance 8,905,200 9,190,000
Extensions and discoveries   186,400
Revision of previous estimates (1,215,700) (1,643,800)
Purchase of minerals in place   1,246,800
Production (320,900) (74,200)
Proved Reserves, Ending Balance 7,368,600 8,905,200
Proved Developed Reserves (Volume) 1,581,500 1,646,700
Proved Undeveloped Reserves (Volume) 5,787,200 7,258,400
Gas (in MMcf)
    
Proved Developed and Undeveloped Reserves [Abstract]    
Proved Reserves, Beginning Balance 11,500 400
Extensions and discoveries   0
Revision of previous estimates 200 6,000
Purchase of minerals in place   5,500
Production (300) (400)
Proved Reserves, Ending Balance 11,400 11,500
Proved Developed Reserves (Volume) 11,400 11,500
Proved Undeveloped Reserves (Volume) 0 0
United States | Oil (in Mbbls)
    
Proved Developed and Undeveloped Reserves [Abstract]    
Proved Reserves, Beginning Balance 8,905,200 9,190,000
Extensions and discoveries   186,400
Revision of previous estimates (1,215,700) (1,643,800)
Purchase of minerals in place   1,246,800
Production (320,900) (74,200)
Proved Reserves, Ending Balance 7,368,600 8,905,200
Proved Developed Reserves (Volume) 1,581,500 1,646,700
Proved Undeveloped Reserves (Volume) 5,787,200 7,258,400
Australia | Gas (in MMcf)
    
Proved Developed and Undeveloped Reserves [Abstract]    
Proved Reserves, Beginning Balance 11,500 [1] 400 [1]
Extensions and discoveries   0 [1]
Revision of previous estimates 200 [1] 6,000 [1]
Purchase of minerals in place 5,500 [1] 5,500 [1]
Production (300) [1] (400) [1]
Proved Reserves, Ending Balance 11,400 [1] 11,500 [1]
Proved Developed Reserves (Volume) 11,400 [1] 11,500 [1]
Proved Undeveloped Reserves (Volume) 0 [1] 0 [1]
[1] The amount of proved reserves applicable to Australia gas reflects the amount of gas committed to specific long term supply contracts.