XML 161 R151.htm IDEA: XBRL DOCUMENT
v3.19.1

Derivative Financial Instruments - Summary of Euro Equivalent the Contractual Amounts of forward Exchange Contracts (Detail) - Forward exchange contract [member] - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | ---
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Notional amount | € 43,645 | € 49,627 | € 67,540
U.S. dollars [member] |  |  |
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Notional amount | 14,528 | 21,979 | 26,670
Euro [member] |  |  |
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Notional amount | 11,407 | 10,226 | 13,925
British pounds [member] |  |  |
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Notional amount | 10,612 | 11,137 | 15,860
Japanese yen [member] |  |  |
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Notional amount | 2,318 | 1,692 | 2,117
Australian dollars [member] |  |  |
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Notional amount | 2,129 | 2,294 | 2,964
Canadian dollars [member] |  |  |
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Notional amount | 1,300 | 1,338 | 4,965
Danish kroner [member] |  |  |
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Notional amount | 1,086 | 713 | 618
Swedish kroner [member] |  |  |
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Notional amount | € 265 | € 248 | € 421

X
- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_NotionalAmount
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Disclosure Of Derivative Financial Instruments [line items] + References No definition available. + Details
Name: | ntz_DisclosureOfDerivativeFinancialInstrumentsLineItems
Namespace Prefix: | ntz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_ForwardContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_GBP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_JPY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_AUD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_CAD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_DKK
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=ntz_KrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |