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Commitments and Contingent Liabilities - Additional information (Detail) - EUR (€) € in Thousands	Dec. 31, 2024	Oct. 31, 2024	Dec. 31, 2023
Disclosure of finance lease and operating lease by lessee [line items]
Contingent liability		€ 2,809
Guarantee period	7 months
Guarantees [member]
Disclosure of finance lease and operating lease by lessee [line items]
Contingent liability	€ 11,767		€ 9,067

X

- Definition

The amount of the estimated financial effect of contingent liabilities. [Refer: Classes of contingent liabilities [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2024-01-01
-Paragraph 86
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_86_a&doctype=Standard
-URIDate 2024-03-27

+ Details

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

X

- Definition

Disclosure of finance lease and operating lease by lessee [line items]

+ References

No definition available.

+ Details

Name:	ntz_DisclosureOfLeasesByLesseeLineItems
Namespace Prefix:	ntz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Guarantee period.

+ References

No definition available.

+ Details

Name:	ntz_GuaranteePeriod
Namespace Prefix:	ntz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ifrs-full_ClassesOfContingentLiabilitiesAxis=ifrs-full_ContingentLiabilityForGuaranteesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: