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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

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- Definition Additions to proved reserves, measured in energy equivalents, that result from (1) improved recovery (2) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (3) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + References No definition available. + Details
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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61797-109447 + Details
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