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Lease liabilities (non-current and current) - Summary of Changes in Carrying Amount of Lease Liabilities (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Non Current And Current Portion Of The Lease Liabilities [Abstract] |  |  |
Balance at beginning of year | € 62,327 | € 51,849 |
Additions for new leases | 5,215 | 9,773 |
Interest expenses | 3,809 | 3,090 | € 2,877
Lease payments | (14,097) | (14,147) | (12,926)
Disposal of leases | (1,911) | (172) |
Adjustments due to remeasurements | 43 | 584 |
Adjustments due to modifications | 9 | 11,867 |
Effect of translation adjustments | 2,356 | (517) |
Balance at end of year | € 57,750 | € 62,327 | € 51,849

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_g&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Additions to lease liabilities. + References No definition available. + Details
Name: | ntz_AdditionsToLeaseLiabilities
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Adjustments due to modifications of leases. + References No definition available. + Details
Name: | ntz_AdjustmentsDueToModificationsOfLeases
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Adjustments due to remeasurements of leases. + References No definition available. + Details
Name: | ntz_AdjustmentsDueToRemeasurementsOfLeases
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cash outflow for lease interest. + References No definition available. + Details
Name: | ntz_CashOutflowForLeaseInterest
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure Of Non Current And Current Portion Of The Lease Liabilities [Abstract]. + References No definition available. + Details
Name: | ntz_DisclosureOfNonCurrentAndCurrentPortionOfTheLeaseLiabilitiesAbstract
Namespace Prefix: | ntz_
Data Type: | xbrli:stringItemType
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- Definition Disposal of leases. + References No definition available. + Details
Name: | ntz_DisposalOfLeases
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase decrease in translation adjustments. + References No definition available. + Details
Name: | ntz_IncreaseDecreaseInTranslationAdjustments
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration