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Right-of-use assets and lease liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
IfrsStatementLineItems [Line Items] |  |
Balance at the beginning of the year | $ 85,265 | $ 74,818
Cost, beginning | 157,708 | 111,562
Accumulated amortization, beginning | (72,443) | (36,744)
New contracts | 50,011 | 64,955
Disposals and write-offs |  | (5,348)
Renegotiation of contracts | 7,919 |
Amortization | (43,972) | (36,189)
Remeasurement | 4,285 | 144
Foreign exchange effect | 3,565 | (13,115)
Effect of new subsidiary acquisition | 3,094 |
Balance at the end of the year | 110,167 | 85,265
Cost, ending | 213,794 | 157,708
Accumulated amortization, ending | (103,627) | (72,443)
Land and buildings [member] |  |
IfrsStatementLineItems [Line Items] |  |
Balance at the beginning of the year | 21,505 |
Cost, beginning | 24,592 |
Accumulated amortization, beginning | (3,087) |
New contracts | 66 |
Renegotiation of contracts | 3,293 |
Amortization | (2,301) |
Remeasurement | (390) |
Foreign exchange effect | (1,629) |
Effect of new subsidiary acquisition | 3,094 |
Balance at the end of the year | 23,638 | 21,505
Cost, ending | 36,673 | 24,592
Accumulated amortization, ending | $ (13,035) | (3,087)
Average annual amortization rates % | 31.00% |
Machinery Equipment And Facilities [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Balance at the beginning of the year | $ 58,559 |
Cost, beginning | 119,566 |
Accumulated amortization, beginning | (61,007) |
New contracts | 43,783 |
Renegotiation of contracts | (51) |
Amortization | (36,410) |
Remeasurement | 1,103 |
Foreign exchange effect | 4,563 |
Balance at the end of the year | 71,547 | 58,559
Cost, ending | 155,940 | 119,566
Accumulated amortization, ending | $ (84,393) | (61,007)
Average annual amortization rates % | 33.00% |
I T Equipment [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Balance at the beginning of the year | $ 346 |
Cost, beginning | 910 |
Accumulated amortization, beginning | (564) |
New contracts | 766 |
Renegotiation of contracts | 3,515 |
Amortization | (270) |
Remeasurement | 181 |
Foreign exchange effect | 38 |
Balance at the end of the year | 4,576 | 346
Cost, ending | 4,976 | 910
Accumulated amortization, ending | $ (400) | (564)
Average annual amortization rates % | 33.00% |
Vehicles [member] |  |
IfrsStatementLineItems [Line Items] |  |
Balance at the beginning of the year | $ 4,855 |
Cost, beginning | 12,640 |
Accumulated amortization, beginning | (7,785) |
New contracts | 5,396 |
Renegotiation of contracts | 1,162 |
Amortization | (4,991) |
Remeasurement | 3,391 |
Foreign exchange effect | 593 |
Balance at the end of the year | 10,406 | 4,855
Cost, ending | 16,205 | 12,640
Accumulated amortization, ending | $ (5,799) | $ (7,785)
Average annual amortization rates % | 33.00% |

X
- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DepreciationRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_j&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_RightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The increase (decrease) in the revaluation surplus that relates to right-of-use assets. [Refer: Revaluation surplus; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 57 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_57&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_RightofuseAssetsIncreaseDecreaseInRevaluationSurplus
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of amortization of right-of-use assets. + References No definition available. + Details
Name: | nexa_AmortizationOfRightofuseAssets
Namespace Prefix: | nexa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The disclosure of average annual amortization rates. + References No definition available. + Details
Name: | nexa_AmortizationRateRightOfUseAssets
Namespace Prefix: | nexa_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The decrease in right-of-use assets resulting from disposals and retirements. + References No definition available. + Details
Name: | nexa_DisposalsAndWriteOffsRightofuseAssets
Namespace Prefix: | nexa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The element represents the effect of new subsidiary acquisition + References No definition available. + Details
Name: | nexa_EffectOfNewSubsidiaryAcquisitionRightofuseAssets
Namespace Prefix: | nexa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The element represents foreign exchange effect right of use assets. + References No definition available. + Details
Name: | nexa_ForeignExchangeEffectRightOfUseAssets
Namespace Prefix: | nexa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | nexa_IfrsStatementLineItems
Namespace Prefix: | nexa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The element represents the renegotiation of contracts + References No definition available. + Details
Name: | nexa_RenegotiationOfContractsRightofuseAssets
Namespace Prefix: | nexa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of accumulated amortization at the beginning of the year + References No definition available. + Details
Name: | nexa_RightofuseAssetsAccumulatedAmortization
Namespace Prefix: | nexa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of cost at the beginning of the year + References No definition available. + Details
Name: | nexa_RightofuseAssetsCost
Namespace Prefix: | nexa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_LandAndBuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=nexa_MachineryEquipmentAndFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=nexa_ITEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |