Impairment of long-lived assets (Details 5) $ in Thousands	Dec. 31, 2025 USD ($)
Tres Marias System [Member]
IfrsStatementLineItems [Line Items]
Excess over recoverable amount	$ 458,634
Percentage assigned change	14.41%
Value of assumption	$ 2,670
Appreciation of BRL percentage	13.46%
Appreciation of BRL price	4.70
Tres Marias System [Member] \| Top of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	111.02%
Tres Marias System [Member] \| Bottom of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	14.94%
Juiz De Fora [Member]
IfrsStatementLineItems [Line Items]
Excess over recoverable amount	$ 51,351
Percentage assigned change	8.04%
Value of assumption	$ 2,869
Appreciation of BRL percentage	3.77%
Appreciation of BRL price	5.23
Juiz De Fora [Member] \| Top of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	24.96%
Juiz De Fora [Member] \| Bottom of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	8.85%
Aripuana [Member]
IfrsStatementLineItems [Line Items]
Excess over recoverable amount	$ 633,312
Percentage assigned change	30.26%
Value of assumption	$ 2,176
Appreciation of BRL percentage	22.70%
Appreciation of BRL price	4.20
Aripuana [Member] \| Top of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	113.29%
Aripuana [Member] \| Bottom of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	15.10%
Cerro Pasco [Member]
IfrsStatementLineItems [Line Items]
Excess over recoverable amount	$ 33,502
Percentage assigned change	2.53%
Value of assumption	$ 3,041
Cerro Pasco [Member] \| Top of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	11.54%
Cerro Pasco [Member] \| Bottom of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	8.51%
Cerro Lindo [Member]
IfrsStatementLineItems [Line Items]
Excess over recoverable amount	$ 431,471
Percentage assigned change	36.33%
Value of assumption	$ 1,987
Cerro Lindo [Member] \| Top of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	133.08%
Cerro Lindo [Member] \| Bottom of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	17.78%
Mining Peru [Member]
IfrsStatementLineItems [Line Items]
Excess over recoverable amount	$ 258,550
Percentage assigned change	11.24%
Value of assumption	$ 2,769
Mining Peru [Member] \| Top of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	43.88%
Mining Peru [Member] \| Bottom of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	10.98%
Cajamarquilla [Member]
IfrsStatementLineItems [Line Items]
Excess over recoverable amount	$ 730,640
Percentage assigned change	51.36%
Value of assumption	$ 1,518
Cajamarquilla [Member] \| Top of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	94.11%
Cajamarquilla [Member] \| Bottom of range [member]
IfrsStatementLineItems [Line Items]
Percentage assigned change	14.81%

The amount by which a cash-generating unit's (group of units') recoverable amount exceeds its carrying amount. [Refer: Carrying amount [member]; Total for all cash-generating units [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2024-01-01
-Paragraph 134
-Subparagraph f
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_134_f_i&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2024-01-01
-Paragraph 135
-Subparagraph e
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_135_e_i&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_AmountByWhichUnitsRecoverableAmountExceedsItsCarryingAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The balance refers to the analyses of CGUs in Brazil, considering the impact of the appreciation of the Brazilian real against the U.S. dollar

+ References

No definition available.

+ Details

Name:	nexa_AppreciationOfBrlPercentage
Namespace Prefix:	nexa_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The balance refers to the analyses of CGUs in Brazil, considering the impact of the appreciation of the Brazilian real against the U.S. dollar

+ References

No definition available.

+ Details

Name:	nexa_AppreciationOfBrlPrice
Namespace Prefix:	nexa_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	nexa_IfrsStatementLineItems
Namespace Prefix:	nexa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

It refers to the percentage assigned to the recoverable amount of a cash-generating unit.

+ References

No definition available.

+ Details

Name:	nexa_PercentageByWhichValueAssignedToKeyAssumptionMustChangeInOrderForUnitSRecoverableAmountToBeEqualToCarryingAmount
Namespace Prefix:	nexa_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The balance refers to the price per ton attributed to zinc, applied to the recoverable amount of a cash-generating unit

+ References

No definition available.

+ Details

Name:	nexa_ValueOfAssumptionInOrderForUnitSRecoverableAmountToBeEqualToCarryingAmount
Namespace Prefix:	nexa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=nexa_TresMariasSystemMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=nexa_JuizDeForaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=nexa_AripuanaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=nexa_CerroPascoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=nexa_CerroLindoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=nexa_MiningPeruMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=nexa_CajamarquillaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: