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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
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Non Current And Current Portion Of The Lease Liabilities [Abstract]
Balance at beginning of year	€ 57,367	€ 56,758
Additions for new leases	10,083	11,544
Interest paid on lease liabilities	2,589	2,291
Lease payments	(12,496)	(14,251)
Disposal of leases	(260)
Adjustments due to remeasurements	850
Adjustments due to modifications	(327)
Rent concessions	(1,799)
Effect of translation adjustments	(2,414)	1,025
Balance at end of year	€ 53,593	€ 57,367

X

- Definition

The cash outflow for leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph g
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_g&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	credit
Period Type:	duration

X

- 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 2020-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2020-01-01

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Balance Type:	credit
Period Type:	instant

X

- Definition

Additions to lease liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
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Balance Type:	credit
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X

- Definition

Adjustments due to modifications of leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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
Period Type:	duration

X

- Definition

Cash outflow for lease interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Corona virus and disease nineteen rent concessions

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
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X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Disposal of leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Increase decrease in translation adjustments.

+ References

No definition available.

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Namespace Prefix:	ntz_
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Balance Type:	credit
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