XML 212 R198.htm IDEA: XBRL DOCUMENT v3.21.1

Income Tax Expense - Summary of Income Tax Rates (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
IRES [member]
Disclosure of effective income tax rate [line items]
Applicable tax rate	24.00%	24.00%	24.00%
IRAP [member]
Disclosure of effective income tax rate [line items]
Applicable tax rate	4.82%	4.82%	4.82%

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_ApplicableTaxRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent effective income tax rate.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ntz_TaxationInformationAxis=ntz_IRESMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ntz_TaxationInformationAxis=ntz_IRAPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: