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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, 2016
Boe
Mcf
bbl
Jun. 30, 2015
Boe
Mcf
bbl
Jun. 30, 2014
Boe
Mcf
bbl
Jun. 30, 2013
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 12,446,394 13,289,510 13,766,440  
Revisions of previous estimates (in BOE) | Boe (964,171) [1] (390,330) [2] (247,350) [3]  
Improved recovery, extensions and discoveries (in BOE) | Boe 0 0 132,884  
Sales of minerals in place (in BOE) | Boe 0 0 (184,722)  
Production (sales volumes) (in BOE) | Boe (658,802) (452,786) (177,742)  
Balance at the end of the period (in BOE) | Boe 10,823,421 12,446,394 13,289,510  
Proved developed reserves (in BOE) | Boe 7,168,249 7,349,626 7,970,562 10,089,861
Proved undeveloped reserves (in BOE) | Boe 3,655,172 5,096,768 5,318,948 3,676,579
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 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) 10,011,976 10,526,344 12,782,755  
Revisions of previous estimates (in Bbls/Mcf) (765,385) [1] (64,074) [2] (1,919,052) [3]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 0 0 17,146  
Sales of minerals in place (in Bbls/Mcf) 0 0 (184,722)  
Production (sales volumes) (in Bbls/Mcf) (658,041) (450,294) (169,783)  
Balance at the end of the period (in Bbls/Mcf) 8,588,550 10,011,976 10,526,344  
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) 7,168,249 7,347,231 7,858,224 10,077,522
Proved undeveloped reserves (in Bbls/Mcf) 1,420,301 2,664,745 2,668,120 2,705,233
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) 2,433,595 2,278,688 979,885  
Revisions of previous estimates (in Bbls/Mcf) (198,233) [1] 156,195 [2] 1,269,588 [3]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 0 0 32,731  
Sales of minerals in place (in Bbls/Mcf) 0 0 0  
Production (sales volumes) (in Bbls/Mcf) (491) (1,288) (3,516)  
Balance at the end of the period (in Bbls/Mcf) 2,234,871 2,433,595 2,278,688  
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) 0 1,572 32,164 8,539
Proved undeveloped reserves (in Bbls/Mcf) 2,234,871 2,432,023 2,246,524 971,346
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)   (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 4,939 2,906,863 22,797  
Revisions of previous estimates (in Bbls/Mcf) | Mcf (3,319) [1] (2,894,703) [2] 2,412,677 [3]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) | Mcf 0 0 498,044  
Sales of minerals in place (in Bbls/Mcf) | Mcf 0 0 0  
Production (sales volumes) (in Bbls/Mcf) | Mcf (1,620) (7,221) (26,655)  
Balance at the end of the period (in Bbls/Mcf) | Mcf 0 4,939 2,906,863  
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 0 4,939 481,042 22,797
Proved undeveloped reserves (in Bbls/Mcf) | Mcf 0 0 2,425,821 0
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   (2,246,524)    
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   (452,786)    
[1] The negative revision results primarily from the removal of proved undeveloped reserves in the far eastern part of the Delhi field, referred to as Test Site 6, which were deemed uneconomic under the lower SEC price case utilized at the end of the period.
[2] The 2,894,703 negative fiscal 2015 revision for natural gas primarily reflects a 2,246,524 MCF negative revision for the Delhi field NGL plant together with a 452,786 MCF negative revision at the Giddings Field for a well that was lost due to mechanical issues. The NGL 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 NGL plant, partly offset by a 29,304 BBL negative revision due to the lost Giddings well.
[3] Significant reserve revisions occurred in the Delhi field during fiscal 2014. As a result of a 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 NGL plant in the Delhi field. The plant was expected to significantly increase recoveries of these products, particularly natural gas, which were not previously planned to be extracted from the injection volumes.