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v3.19.2

Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) - Estimated Quantities of Proved Oil and Natural Gas Reserves (Details) | 12 Months Ended |
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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.

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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=68064819&loc=d3e61797-109447 + Details
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