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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) - Estimated Quantities of Proved Oil and Natural Gas Reserves (Details)
 12 Months Ended
Jun. 30, 2014
Boe
Jun. 30, 2013
Boe
Jun. 30, 2012
Boe
Jun. 30, 2011
Boe
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in BOE) 13,766,440 13,441,116 13,847,462  
Revisions of previous estimates (in BOE) (247,350) [1] 2,806,181 [2] (344,440)  
Improved recovery, extensions and discoveries (in BOE) 132,884   146,249  
Sales of minerals in place (in BOE) (184,722) (2,254,038)    
Production (sales volumes) (in BOE) (177,742) (226,819) (208,155)  
Balance at the end of the period (in BOE) 13,289,510 13,766,440 13,441,116  
Proved developed reserves (in BOE) 7,970,562 10,089,861 8,032,809 5,344,471
Crude Oil
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in Bbls/Mcf) 12,782,755 11,638,618 11,567,846  
Revisions of previous estimates (in Bbls/Mcf) (1,919,052) [1] 1,826,053 [2] 84,219  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 17,146   137,634  
Sales of minerals in place (in Bbls/Mcf) (184,722) (485,536)    
Production (sales volumes) (in Bbls/Mcf) (169,783) (196,380) (151,081)  
Balance at the end of the period (in Bbls/Mcf) 10,526,344 12,782,755 11,638,618  
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Proved developed reserves (in Bbls/Mcf) 7,858,224 10,077,522 7,670,934 4,986,337
Natural Gas Liquids
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in Bbls/Mcf) 979,885 492,473 712,300  
Revisions of previous estimates (in Bbls/Mcf) 1,269,588 [1] 975,515 [2] (212,677)  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 32,731   5,461  
Sales of minerals in place (in Bbls/Mcf) 0 (480,832)    
Production (sales volumes) (in Bbls/Mcf) (3,516) (7,271) (12,611)  
Balance at the end of the period (in Bbls/Mcf) 2,278,688 979,885 492,473  
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Proved developed reserves (in Bbls/Mcf) 32,164 8,539 111,978 100,900
Natural Gas
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in Bbls/Mcf) 22,797 7,860,156 9,403,899  
Revisions of previous estimates (in Bbls/Mcf) 2,412,677 [1] 27,679 [2] (1,295,893)  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 498,044   18,925  
Sales of minerals in place (in Bbls/Mcf) 0 (7,726,032)    
Production (sales volumes) (in Bbls/Mcf) (26,655) (139,006) (266,775)  
Balance at the end of the period (in Bbls/Mcf) 2,906,863 22,797 7,860,156  
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Proved developed reserves (in Bbls/Mcf) 481,042 22,797 1,499,382 1,543,401
[1] Significant reserve revisions occurred in the Delhi Field during fiscal 2014. As a result of an adverse fluid release event in the Field, certain oil reserves were reclassified from proved to an unproved category based on the operator's decision to defer CO2 injections in certain parts of the Field. There was a positive revision to estimated proved reserves of natural gas liquids and natural gas as a result of an improved design for the gas plant in the Delhi Field. The plant is expected to significantly increase recoveries of these products, particularly natural gas, which was not previously planned to be extracted from the injection volumes.
[2] A significant upward reserve revision occurred in the Delhi Field during fiscal 2013 as a result of (1) revised geological maps based on production results and acquired seismic data, (2) inclusion of an additional reservoir with similar features, production history and suitability for EOR, and (3) inclusion of natural gas processing at Delhi.