XML 147 R137.htm IDEA: XBRL DOCUMENT v3.19.1

Employees' Leaving Entitlement - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Changes in net defined benefit liability (asset) [abstract]
Average duration of defined benefit plans	10 years 7 months 17 days	11 years 2 months 8 days

X

- References

No definition available.

+ Details

Name:	ifrs-full_ChangesInNetDefinedBenefitLiabilityAssetAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Average duration of defined benefit plans.

+ References

No definition available.

+ Details

Name:	ntz_AverageDurationOfDefinedBenefitPlans
Namespace Prefix:	ntz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration