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Lease liabilities (non-current and current) - Summary of Changes in Carrying Amount of Lease Liabilities (Details) € in Thousands	12 Months Ended
	Dec. 31, 2019 EUR (€)
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]
Balance as at January 1, 2019	€ 56,758
Additions for new leases	11,544
Interest expense	2,291
Lease payments	(14,251)
Effect of translation adjustments	1,025
Balance as at December 31, 2019	€ 57,367

X

- Definition

The cash outflow for leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 53
-Subparagraph g
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_g&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_CashOutflowForLeases
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
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 2019-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2019-03-27

+ Details

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

X

- Definition

Additions to lease liabilities.

+ References

No definition available.

+ Details

Name:	ntz_AdditionsToLeaseLiabilities
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

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

X

- Definition

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

+ References

No definition available.

+ Details

Name:	ntz_DisclosureOfNonCurrentAndCurrentPortionOfTheLeaseLiabilitiesLineItems
Namespace Prefix:	ntz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Increase decrease in translation adjustments.

+ References

No definition available.

+ Details

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