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, 2012
MBbls
Jun. 30, 2011
MBbls
Jun. 30, 2010
MBbls
Oil (in Mbbls)
      
Proved Developed and Undeveloped Reserves [Abstract]      
Proved Reserves, Beginning Balance 9,190,000 9,478,000 996,000
Extensions and discoveries 186,400 6,000 6,963,000
Revision of previous estimates (1,643,800) (340,000) (768,000)
Purchase of minerals in place 1,246,800 178,000 2,631,000
Sales of minerals in place     (205,000)
Production (74,200) (132,000) (139,000)
Proved Reserves, Ending Balance 8,905,200 9,190,000 9,478,000
Proved Developed Reserves (Volume) 1,646,700 2,249,000 2,515,000
Proved Undeveloped Reserves (Volume) 7,258,400 6,941,000 6,963,000
Gas (in MMcf)
      
Proved Developed and Undeveloped Reserves [Abstract]      
Proved Reserves, Beginning Balance 400 1,500 3,300
Extensions and discoveries 0 0 0
Revision of previous estimates 6,000 (200) 1,600
Purchase of minerals in place 5,500 0 0
Sales of minerals in place     0
Production (400) (900) (3,400)
Proved Reserves, Ending Balance 11,500 400 1,500
Proved Developed Reserves (Volume) 11,500 400 1,500
Proved Undeveloped Reserves (Volume) 0 0 0
United States | Oil (in Mbbls)
      
Proved Developed and Undeveloped Reserves [Abstract]      
Proved Reserves, Beginning Balance 9,190,000 9,478,000 0
Extensions and discoveries 186,400 6,000 6,963,000
Revision of previous estimates (1,643,800) (404,000) (74,000)
Purchase of minerals in place 1,246,800 178,000 2,631,000
Sales of minerals in place     0
Production (74,200) (68,000) (42,000)
Proved Reserves, Ending Balance 8,905,200 9,190,000 9,478,000
Proved Developed Reserves (Volume) 1,646,700 2,249,000 2,515,000
Proved Undeveloped Reserves (Volume) 7,258,400 6,941,000 6,963,000
United States | Gas (in MMcf)
      
Proved Developed and Undeveloped Reserves [Abstract]      
Proved Reserves, Beginning Balance 0 0 0
Extensions and discoveries 0 0 0
Revision of previous estimates 0 0 0
Purchase of minerals in place 0 0 0
Sales of minerals in place     0
Production 0 0 0
Proved Reserves, Ending Balance 0 0 0
Proved Developed Reserves (Volume) 0 0 0
Proved Undeveloped Reserves (Volume) 0 0 0
Australia | Oil (in Mbbls)
      
Proved Developed and Undeveloped Reserves [Abstract]      
Proved Reserves, Beginning Balance 0 [1] 0 [1] 996,000 [1]
Extensions and discoveries 0 [1] 0 [1] 0 [1]
Revision of previous estimates 0 [1] 64,000 [1] (694,000) [1]
Purchase of minerals in place 0 [1] 0 [1] 0 [1]
Sales of minerals in place     (205,000) [1]
Production 0 [1] (64,000) [1] (97,000) [1]
Proved Reserves, Ending Balance 0 [1] 0 [1] 0 [1]
Proved Developed Reserves (Volume) 0 [1] 0 [1] 0 [1]
Proved Undeveloped Reserves (Volume) 0 [1] 0 [1] 0 [1]
Australia | Gas (in MMcf)
      
Proved Developed and Undeveloped Reserves [Abstract]      
Proved Reserves, Beginning Balance 400 [1] 1,500 [1] 3,300 [1]
Extensions and discoveries 0 [1] 0 [1] 0 [1]
Revision of previous estimates 6,000 [1] (200) [1] 1,600 [1]
Purchase of minerals in place 5,500 [1] 0 [1] 0 [1]
Sales of minerals in place     0 [1]
Production (400) [1] (900) [1] (3,400) [1]
Proved Reserves, Ending Balance 11,500 [1] 400 [1] 1,500 [1]
Proved Developed Reserves (Volume) 11,500 [1] 400 [1] 1,500 [1]
Proved Undeveloped Reserves (Volume) 0 [1] 0 [1] 0 [1]
[1] The amount of proved reserves applicable to Australia gas reflects the amount of gas committed to specific contracts and is net of royalties.