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Trade Payables - Summary of Trade Payables (Detail) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Trade and other current payables [abstract] |  |
Invoices received | € 47,402 | € 57,325
Invoices to be received | 21,074 | 20,576
Trade payables | € 68,476 | € 77,901

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- Definition The amount of current trade payables and current other payables. [Refer: Current trade payables; Other current payables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph k -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_k&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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- Definition Trade and other current payables, invoices received. + References No definition available. + Details
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Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Trade and other current payables, invoices to be received + References No definition available. + Details
Name: | ntz_TradeAndOtherCurrentPayablesInvoicesToBeReceived
Namespace Prefix: | ntz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant