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Trade Payables - Summary of Trade Payables (Detail) - EUR (€) € in Thousands	Dec. 31, 2019	Dec. 31, 2018
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
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-URIDate 2019-03-27

+ Details

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

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
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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

X

- 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