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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, 2018
Boe
Mcf
bbl
Jun. 30, 2017
Boe
Mcf
bbl
Jun. 30, 2016
Boe
Mcf
bbl
Jun. 30, 2015
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 10,058,378 10,823,421 12,446,394  
Revisions of previous estimates (in BOE) | Boe 54,881 [1] 3,390 [2] (964,171) [3]  
Improved recovery, extensions and discoveries (in BOE) | Boe 0 0 0  
Sales of minerals in place (in BOE) | Boe 0 0 0  
Production (sales volumes) (in BOE) | Boe (745,297) (768,433) (658,802)  
Balance at the end of the period (in BOE) | Boe 9,367,962 10,058,378 10,823,421  
Proved developed reserves (in BOE) | Boe 7,285,591 7,950,192 7,168,249 7,349,626
Proved undeveloped reserves (in BOE) | Boe 2,082,371 2,108,186 3,655,172 5,096,768
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) 8,372,150 8,588,550 10,011,976  
Revisions of previous estimates (in Bbls/Mcf) 369,971 [1] 508,123 [2] (765,385) [3]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 0 0 0  
Sales of minerals in place (in Bbls/Mcf) 0 0 0  
Production (sales volumes) (in Bbls/Mcf) (651,931) (724,523) (658,041)  
Balance at the end of the period (in Bbls/Mcf) 8,090,190 8,372,150 8,588,550  
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) 6,291,850 6,617,389 7,168,249 7,347,231
Proved undeveloped reserves (in Bbls/Mcf) 1,798,340 1,754,761 1,420,301 2,664,745
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) 1,686,228 2,234,871 2,433,595  
Revisions of previous estimates (in Bbls/Mcf) (315,090) [1] (504,733) [2] (198,233) [3]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 0 0 0  
Sales of minerals in place (in Bbls/Mcf) 0 0 0  
Production (sales volumes) (in Bbls/Mcf) (93,366) (43,910) (491)  
Balance at the end of the period (in Bbls/Mcf) 1,277,772 1,686,228 2,234,871  
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) 993,741 1,332,803 0 1,572
Proved undeveloped reserves (in Bbls/Mcf) 284,031 353,425 2,234,871 2,432,023
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 0 0 4,939  
Revisions of previous estimates (in Bbls/Mcf) | Mcf 0 [1] 16 [2] (3,319) [3]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) | Mcf 0 0 0  
Sales of minerals in place (in Bbls/Mcf) | Mcf 0 0 0  
Production (sales volumes) (in Bbls/Mcf) | Mcf 0 (16) (1,620)  
Balance at the end of the period (in Bbls/Mcf) | Mcf 0 0 0  
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 0 0 4,939
Proved undeveloped reserves (in Bbls/Mcf) | Mcf 0 0 0 0
[1] The positive crude oil revision resulted from better production performance during fiscal 2018. The negative NGL revision results primarily from lower expectations for ultimate NGL recoveries from the plant based on production data subsequent to the commencement of plant production.
[2] The positive crude oil revision resulted from better production performance during fiscal 2017 and the expectation of greater ultimate recoveries of oil from the Delhi field. The negative NGL revision results primarily from lower expectations for ultimate NGL recoveries from the plant based on production data after the plant commenced production.
[3] 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.