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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, 2015
Boe
Mcf
bbl
Jun. 30, 2014
Boe
Mcf
bbl
Jun. 30, 2013
Boe
Mcf
bbl
Jun. 30, 2012
Boe
Mcf
bbl
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) | Boe 13,289,510 13,766,440 13,441,116  
Revisions of previous estimates (in BOE) | Boe (390,330) [1] (247,350) [2] 2,806,181 [3]  
Improved recovery, extensions and discoveries (in BOE) | Boe 0 132,884    
Sales of minerals in place (in BOE) | Boe 0 (184,722) (2,254,038)  
Production (sales volumes) (in BOE) | Boe (452,786) (177,742) (226,819)  
Balance at the end of the period (in BOE) | Boe 12,446,394 13,289,510 13,766,440  
Proved developed reserves (in BOE) | Boe 7,349,626 7,970,562 10,089,861 8,032,809
Proved undeveloped reserves (in BOE) | Boe 5,096,768 5,318,948 3,676,579 5,408,307
Delhi Field        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Positive revision of previous estimate (in BOE) | Boe   1,679,481    
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) 10,526,344 12,782,755 11,638,618  
Revisions of previous estimates (in Bbls/Mcf) (64,074) [1] (1,919,052) [2] 1,826,053 [3]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 0 17,146    
Sales of minerals in place (in Bbls/Mcf) 0 (184,722) (485,536)  
Production (sales volumes) (in Bbls/Mcf) (450,294) (169,783) (196,380)  
Balance at the end of the period (in Bbls/Mcf) 10,011,976 10,526,344 12,782,755  
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) 7,347,231 7,858,224 10,077,522 7,670,934
Proved undeveloped reserves (in Bbls/Mcf) 2,664,745 2,668,120 2,705,233 3,967,684
Crude Oil | Delhi Field        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revisions of previous estimates (in Bbls/Mcf)   1,817,224    
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) 2,278,688 979,885 492,473  
Revisions of previous estimates (in Bbls/Mcf) 156,195 [1] 1,269,588 [2] 975,515 [3]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 0 32,731    
Sales of minerals in place (in Bbls/Mcf) 0 0 (480,832)  
Production (sales volumes) (in Bbls/Mcf) (1,288) (3,516) (7,271)  
Balance at the end of the period (in Bbls/Mcf) 2,433,595 2,278,688 979,885  
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) 1,572 32,164 8,539 111,978
Proved undeveloped reserves (in Bbls/Mcf) 2,432,023 2,246,524 971,346 380,495
Revision due to improved design (in Bbls/Mcf) [1] 185,499      
Natural Gas Liquids | Delhi Field        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revision due to improved design (in Bbls/Mcf)   1,275,178    
Natural Gas Liquids | Giddings Field        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revisions of previous estimates (in Bbls/Mcf) [1] (29,304)      
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) | Mcf 2,906,863 22,797 7,860,156  
Revisions of previous estimates (in Bbls/Mcf) | Mcf (2,894,703) [1] 2,412,677 [2] 27,679 [3]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) | Mcf 0 498,044    
Sales of minerals in place (in Bbls/Mcf) | Mcf 0 0 (7,726,032)  
Production (sales volumes) (in Bbls/Mcf) | Mcf (7,221) (26,655) (139,006)  
Balance at the end of the period (in Bbls/Mcf) | Mcf 4,939 2,906,863 22,797  
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) | Mcf 4,939 481,042 22,797 1,499,382
Proved undeveloped reserves (in Bbls/Mcf) | Mcf 0 2,425,821 0 6,360,774
Natural Gas | Delhi Field        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revisions of previous estimates (in Bbls/Mcf) | Mcf [1] (2,246,524)      
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revision due to improved design (in Bbls/Mcf) | Mcf   2,425,821    
Natural Gas | Giddings Field        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revisions of previous estimates (in Bbls/Mcf) | Mcf [1] (452,786)      
[1] The 2,894,703 negative fiscal 2015 revision for natural gas primarily reflects a 2,246,524 MCF negative revision for the Delhi Field gas plant together with a 452,786 MCF negative revision at the Giddings Field for a well that was lost due to excessive formation solids that kept interfering with pumping. The gas plant revision resulted from a decision during the current fiscal year to use the methane production internally to reduce field operating costs rather than selling it into the market. The 156,195 BBL positive natural gas liquids revision primarily reflects 185,499 BBL positive revision for better recovery from the redesigned gas plant, partly offset by a 29,304 BBL negative revision due to the lost Giddings well.
[2] Significant reserve revisions occurred in the Delhi Field during fiscal 2014. As a result of an adverse fluid release event in the Field, 1,817,224 BBLs of oil reserves were reclassified from proved to probable category based on the operator's decision to defer CO2 injections in certain parts of the Field. There was a positive revision of 1,679,481 BOE, which was comprised of 1,275,178 BBLs of natural gas liquids and 2,425,821 MCF of 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.
[3] 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.