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Lease liabilities (non-current and current) - Additional information (Detail) € in Thousands	Dec. 31, 2019 EUR (€)
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]
Undiscounted lease liabilities	€ 68,228
Foreign countries [member]
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]
Undiscounted lease liabilities	€ 38,844
Bottom of range [member]
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]
Borrowings interest rate	3.00%
Top of range [member]
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]
Borrowings interest rate	12.00%

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard
-URIDate 2019-03-27

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Disclosure Of Non Current And Current Portion Of The Lease Liabilities [line items].

+ References

No definition available.

+ Details

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X

- Definition

Lease liabilities undiscounted cash flows.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
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Balance Type:	credit
Period Type:	instant

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- Details

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- Details

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- Details

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