Related parties (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
IfrsStatementLineItems [Line Items]
Related parties assets	$ 2	$ 1,546
Trade payables, lease and confirming liabilities	76,348	38,832
Related parties liabilities	4,695	4,085
Trade accounts receivable	1,532	885
Dividends payable	26,918	3,707
Cash and cash equivalents	40,294	44,251
Cash and cash equivalents current	40,294	44,251
Trade accounts receivable, current	1,532	885
Trade payables, lease and confirming liabilities, current	72,292	35,806
Dividends payable, current	26,918	3,707
Related parties' liabilities, noncurrent	2	1,546
Trade Payables and Leases, non current	4,056	3,026
Total assets and liabilities	2	1,546
Votorantim S. A. [Member]
IfrsStatementLineItems [Line Items]
Related parties assets	2	2
Trade payables, lease and confirming liabilities	1,418	101
Related parties liabilities	4,694	3,658
Acerbrag S A [Member]
IfrsStatementLineItems [Line Items]
Trade accounts receivable	792
Auren Comercializadora De Energia Ltda [Member]
IfrsStatementLineItems [Line Items]
Trade payables, lease and confirming liabilities	564	907
Auren Energia S A [Member]
IfrsStatementLineItems [Line Items]
Dividends payable	24,234	1,307
Campos Novos Energia S.a [Member]
IfrsStatementLineItems [Line Items]
Related parties assets		1,544
Trade payables, lease and confirming liabilities	10,008	7,104
Companhia Brasileira De Aluminio [Member]
IfrsStatementLineItems [Line Items]
Trade payables, lease and confirming liabilities		70
Related parties liabilities	1	7
Trade accounts receivable	163	299
Scotiabank Peru S A A [Member]
IfrsStatementLineItems [Line Items]
Trade payables, lease and confirming liabilities	63,866	30,216
Cash and cash equivalents	40,294	44,251
Votorantim Cimentos S.a. [Member]
IfrsStatementLineItems [Line Items]
Trade payables, lease and confirming liabilities	393	412
Trade accounts receivable	576	586
Votorantim International Csc S.a.c [Member]
IfrsStatementLineItems [Line Items]
Related parties liabilities		420
Other related parties [member]
IfrsStatementLineItems [Line Items]
Trade payables, lease and confirming liabilities	99	22
Trade accounts receivable	1
Dividends payable	$ 2,684	$ 2,400

The amount of current dividend payables. [Refer: Dividend payables]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_CurrentDividendPayables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of dividends that the company has declared but not yet paid.

+ References

+ Details

Name:	ifrs-full_DividendPayables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of non-current receivables due from related parties. [Refer: Total for all related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 78
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2024-03-27

+ Details

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

- Definition

The amount of current payables due to related parties. [Refer: Total for all related parties [member]; Payables to related parties]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 78
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_TradeAndOtherCurrentPayablesToRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of current receivables due from related parties. [Refer: Total for all related parties [member]]

+ References

+ Details

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

- Definition

The amount of payables due to related parties. [Refer: Total for all related parties [member]]

+ References

+ Details

Name:	ifrs-full_TradeAndOtherPayablesToRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of receivables due from related parties. [Refer: Total for all related parties [member]]

+ References

+ Details

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

- Definition

The amount related to interest expenses on lease contracts with banks, for which one of the Company’s board of directors’ member is an independent chairman and may have significant influence.

+ References

No definition available.

+ Details

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

- Definition

The amount related to interest expenses on lease contracts with banks, for which one of the Company’s board of directors’ member is an independent chairman and may have significant influence.

+ References

No definition available.

+ Details

Name:	nexa_CashAndCashEquivalentsToRelatedPartiesCurrent
Namespace Prefix:	nexa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

The element represents related parties assets.

+ References

No definition available.

+ Details

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

- Definition

The element represents related parties liabilities.

+ References

No definition available.

+ Details

Name:	nexa_RelatedPartiesLiabilities
Namespace Prefix:	nexa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of total assets e liabilities.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

Name:	nexa_TradeAndOtherNonCurrentPayablesToRelatedParties
Namespace Prefix:	nexa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nexa_VotorantimS.A.Member
Namespace Prefix:
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- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nexa_AcerbragSAMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nexa_AurenComercializadoraDeEnergiaLtdaMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nexa_AurenEnergiaSAMember
Namespace Prefix:
Data Type:	na
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Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nexa_CamposNovosEnergiaS.aMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nexa_CompanhiaBrasileiraDeAluminioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nexa_ScotiabankPeruSAAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nexa_VotorantimCimentosS.a.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nexa_VotorantimInternationalCscS.a.cMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_OtherRelatedPartiesMember
Namespace Prefix:
Data Type:	na
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