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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, 2020
Boe
Mcf
bbl
Jun. 30, 2019
Boe
Mcf
bbl
Jun. 30, 2018
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 8,980,492 9,367,962  
Revisions of previous estimates (in BOE) | Boe (1,443,618) 351,498  
Improved recovery, extensions and discoveries (in BOE) | Boe 0 0  
Purchase of reserves in place (in BOE) | Boe 3,426,756    
Sales of minerals in place (in BOE) | Boe 0 0  
Production (sales volumes) (in BOE) | Boe (744,804) (738,968)  
Balance at the end of the period (in BOE) | Boe 10,218,826 8,980,492  
Proved developed reserves (in BOE) | Boe 8,354,967 7,398,209 7,285,591
Proved undeveloped reserves (in BOE) | Boe 1,863,859 1,582,283 2,082,371
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) 7,615,731 8,090,190  
Revisions of previous estimates (in Bbls/Mcf) (2,177,787) 152,420  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 0 0  
Purchase of reserves in place (in Bbls/Mcf) 3,426,756    
Sales of minerals in place (in Bbls/Mcf) 0 0  
Production (sales volumes) (in Bbls/Mcf) (638,464) (626,879)  
Balance at the end of the period (in Bbls/Mcf) 8,226,236 7,615,731  
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) 6,577,731 6,273,907 6,291,850
Proved undeveloped reserves (in Bbls/Mcf) 1,648,505 1,341,824 1,798,340
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) 1,364,761 1,277,772  
Revisions of previous estimates (in Bbls/Mcf) 734,169 199,078  
Improved recovery, extensions and discoveries (in Bbls/Mcf) 0 0  
Purchase of reserves in place (in Bbls/Mcf) 0    
Sales of minerals in place (in Bbls/Mcf) 0 0  
Production (sales volumes) (in Bbls/Mcf) (106,340) (112,089)  
Balance at the end of the period (in Bbls/Mcf) 1,992,590 1,364,761  
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) 1,777,236 1,124,302 993,741
Proved undeveloped reserves (in Bbls/Mcf) 215,354 240,459 284,031
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 0  
Improved recovery, extensions and discoveries (in Bbls/Mcf) | Mcf 0 0  
Purchase of reserves in place (in Bbls/Mcf) | Mcf 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