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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Non Current And Current Portion Of The Lease Liabilities [Abstract] |  |  |
Balance at beginning of year | € 53,593 | € 57,367 |
Additions for new leases | 3,194 | 10,083 |
Interest expenses | 2,603 | 2,589 | € 2,291
Lease payments | (12,693) | (12,496) | (14,251)
Disposal of leases | (58) | (260) |
Adjustments due to remeasurements | 9,084 | 850 |
Adjustments due to modifications | 41 | (327) |
Covid-19 rent concessions | (1,515) | (1,799) |
Effect of translation adjustments | 2,889 | (2,414) |
Balance at end of year | € 57,138 | € 53,593 | € 57,367

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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 2021-01-01 -Paragraph 53 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_g&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Additions to lease liabilities. + References No definition available. + Details
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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
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Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Cash outflow for lease interest. + References No definition available. + Details
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Namespace Prefix: | ntz_
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- Definition Corona virus and disease nineteen rent concessions + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Disclosure Of Non Current And Current Portion Of The Lease Liabilities [Abstract]. + References No definition available. + Details
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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
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Namespace Prefix: | ntz_
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