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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) - Estimated Quantities of Proved Oil and Natural Gas Reserves (Details)
$ in Millions
 12 Months Ended
May 07, 2021
USD ($)
Jun. 30, 2021
Boe
bbl
Mcf
Jun. 30, 2020
Boe
bbl
Mcf
Jun. 30, 2019
Boe
bbl
Mcf
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   10,218,826 8,980,492  
Revisions of previous estimates (in BOE) | Boe   754,905 (1,443,618)  
Improved recovery, extensions and discoveries (in BOE) | Boe   0 0  
Purchase of reserves in place (in BOE) | Boe   13,299,468 3,426,756  
Sales of minerals in place (in BOE) | Boe   0 0  
Production (sales volumes) (in BOE) | Boe   (886,922) (744,804)  
Balance at the end of the period (in BOE) | Boe   23,386,277 10,218,826  
Proved developed reserves (in BOE) | Boe   21,573,184 8,354,967 7,398,209
Proved undeveloped reserves (in BOE) | Boe   1,813,092 1,863,859 1,582,283
Barnett Shale        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Purchase price of oil and gas assets | $ $ 18.3      
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)   8,226,236 7,615,731  
Revisions of previous estimates (in Bbls/Mcf)   661,711 (2,177,787)  
Improved recovery, extensions and discoveries (in Bbls/Mcf)   0 0  
Purchase of reserves in place (in Bbls/Mcf)   86,608 3,426,756  
Sales of minerals in place (in Bbls/Mcf)   0 0  
Production (sales volumes) (in Bbls/Mcf)   (554,888) (638,464)  
Balance at the end of the period (in Bbls/Mcf)   8,419,667 8,226,236  
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)   6,815,126 6,577,731 6,273,907
Proved undeveloped reserves (in Bbls/Mcf)   1,604,541 1,648,505 1,341,824
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)   1,992,590 1,364,761  
Revisions of previous estimates (in Bbls/Mcf)   93,139 734,169  
Improved recovery, extensions and discoveries (in Bbls/Mcf)   0 0  
Purchase of reserves in place (in Bbls/Mcf)   4,957,226 0  
Sales of minerals in place (in Bbls/Mcf)   0 0  
Production (sales volumes) (in Bbls/Mcf)   (171,451) (106,340)  
Balance at the end of the period (in Bbls/Mcf)   6,871,504 1,992,590  
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)   6,662,952 1,777,236 1,124,302
Proved undeveloped reserves (in Bbls/Mcf)   208,551 215,354 240,459
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   330 0  
Improved recovery, extensions and discoveries (in Bbls/Mcf) | Mcf   0 0  
Purchase of reserves in place (in Bbls/Mcf) | Mcf   49,533,801  
Sales of minerals in place (in Bbls/Mcf) | Mcf   0 0  
Production (sales volumes) (in Bbls/Mcf) | Mcf   (963,496) 0  
Balance at the end of the period (in Bbls/Mcf) | Mcf   48,570,635 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   48,570,634 0 0
Proved undeveloped reserves (in Bbls/Mcf) | Mcf   0 0 0