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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, 2019
Boe
Mcf
bbl
Jun. 30, 2018
Boe
Mcf
bbl
Jun. 30, 2017
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 9,367,962 10,058,378  
Revisions of previous estimates (in BOE) | Boe 351,498 [1] 54,881 [2]  
Improved recovery, extensions and discoveries (in BOE) | Boe 0 0  
Sales of minerals in place (in BOE) | Boe 0 0  
Production (sales volumes) (in BOE) | Boe (738,968) (745,297)  
Balance at the end of the period (in BOE) | Boe 8,980,492 9,367,962  
Proved developed reserves (in BOE) | Boe 7,398,209 7,285,591 7,950,192
Proved undeveloped reserves (in BOE) | Boe 1,582,283 2,082,371 2,108,186
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) 8,090,190 8,372,150  
Revisions of previous estimates (in Bbls/Mcf) 152,420 [1] 369,971 [2]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 0 0  
Sales of minerals in place (in Bbls/Mcf) 0 0  
Production (sales volumes) (in Bbls/Mcf) (626,879) (651,931)  
Balance at the end of the period (in Bbls/Mcf) 7,615,731 8,090,190  
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) 6,273,907 6,291,850 6,617,389
Proved undeveloped reserves (in Bbls/Mcf) 1,341,824 1,798,340 1,754,761
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) 1,277,772 1,686,228  
Revisions of previous estimates (in Bbls/Mcf) 199,078 [1] (315,090) [2]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 0 0  
Sales of minerals in place (in Bbls/Mcf) 0 0  
Production (sales volumes) (in Bbls/Mcf) (112,089) (93,366)  
Balance at the end of the period (in Bbls/Mcf) 1,364,761 1,277,772  
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) 1,124,302 993,741 1,332,803
Proved undeveloped reserves (in Bbls/Mcf) 240,459 284,031 353,425
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  
Revisions of previous estimates (in Bbls/Mcf) | Mcf 0 [1] 0 [2]  
Improved recovery, extensions and discoveries (in Bbls/Mcf) | Mcf 0 0  
Sales of minerals in place (in Bbls/Mcf) | Mcf 0 0  
Production (sales volumes) (in Bbls/Mcf) | Mcf 0 0  
Balance at the end of the period (in Bbls/Mcf) | Mcf 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
Proved undeveloped reserves (in Bbls/Mcf) | Mcf 0 0 0
[1] The positive crude oil and NGL revisions were the result of improvements in well and NGL plant performance respectively.
[2] 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.