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v3.23.1

Derivative Financial Instruments - Volume of derivative activities (Details) | Mar. 31, 2023 $ / Mcf $ / bbl Mcf bbl
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Producer 3-way (oil) |
Derivative instruments |
Derivative volume activity | bbl | 777,410
Producer 3-way (oil) | Second Quarter |
Derivative instruments |
Derivative volume activity | bbl | 340,263
Producer 3-way (oil) | Third Quarter |
Derivative instruments |
Derivative volume activity | bbl | 228,659
Producer 3-way (oil) | Fourth Quarter |
Derivative instruments |
Derivative volume activity | bbl | 208,488
Producer 3-way (oil) | Weighted-average sub-floor price |
Derivative instruments |
Derivative contract prices | 61.21
Producer 3-way (oil) | Weighted-average sub-floor price | Second Quarter |
Derivative instruments |
Derivative contract prices | 62.22
Producer 3-way (oil) | Weighted-average sub-floor price | Third Quarter |
Derivative instruments |
Derivative contract prices | 60.42
Producer 3-way (oil) | Weighted-average sub-floor price | Fourth Quarter |
Derivative instruments |
Derivative contract prices | 60.43
Producer 3-way (oil) | Weighted-average floor price |
Derivative instruments |
Derivative contract prices | 78.86
Producer 3-way (oil) | Weighted-average floor price | Second Quarter |
Derivative instruments |
Derivative contract prices | 77.89
Producer 3-way (oil) | Weighted-average floor price | Third Quarter |
Derivative instruments |
Derivative contract prices | 79.25
Producer 3-way (oil) | Weighted-average floor price | Fourth Quarter |
Derivative instruments |
Derivative contract prices | 80.00
Producer 3-way (oil) | Weighted-average ceiling price |
Derivative instruments |
Derivative contract prices | 100.36
Producer 3-way (oil) | Weighted-average ceiling price | Second Quarter |
Derivative instruments |
Derivative contract prices | 99.23
Producer 3-way (oil) | Weighted-average ceiling price | Third Quarter |
Derivative instruments |
Derivative contract prices | 100.61
Producer 3-way (oil) | Weighted-average ceiling price | Fourth Quarter |
Derivative instruments |
Derivative contract prices | 101.92
Collar (natural gas) |
Derivative instruments |
Derivative volume activity | Mcf | 7,651,421
Collar (natural gas) | Second Quarter |
Derivative instruments |
Derivative volume activity | Mcf | 3,051,421
Collar (natural gas) | Third Quarter |
Derivative instruments |
Derivative volume activity | Mcf | 2,530,000
Collar (natural gas) | Fourth Quarter |
Derivative instruments |
Derivative volume activity | Mcf | 2,070,000
Collar (natural gas) | Weighted-average floor price |
Derivative instruments |
Derivative contract prices | $ / Mcf | 4.27
Collar (natural gas) | Weighted-average floor price | Second Quarter |
Derivative instruments |
Derivative contract prices | $ / Mcf | 4.12
Collar (natural gas) | Weighted-average floor price | Third Quarter |
Derivative instruments |
Derivative contract prices | $ / Mcf | 4.25
Collar (natural gas) | Weighted-average floor price | Fourth Quarter |
Derivative instruments |
Derivative contract prices | $ / Mcf | 4.50
Collar (natural gas) | Weighted-average ceiling price |
Derivative instruments |
Derivative contract prices | $ / Mcf | 5.91
Collar (natural gas) | Weighted-average ceiling price | Second Quarter |
Derivative instruments |
Derivative contract prices | $ / Mcf | 5.63
Collar (natural gas) | Weighted-average ceiling price | Third Quarter |
Derivative instruments |
Derivative contract prices | $ / Mcf | 5.90
Collar (natural gas) | Weighted-average ceiling price | Fourth Quarter |
Derivative instruments |
Derivative contract prices | $ / Mcf | 6.35

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- Definition Represents information pertaining to contract price per unit of derivative contracts. + References No definition available. + Details
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Namespace Prefix: | grnt_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents information pertaining derivative contracts by volume (Bbl and Mcf). + References No definition available. + Details
Name: | grnt_DerivativeVolumeActivity
Namespace Prefix: | grnt_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=grnt_Producer3WayCrudeOilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | grnt_DerivativeVolumeActivitySettlementPeriodAxis=grnt_ThirdQuarterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=grnt_CollarNaturalGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |