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Fair Value Measurement - Schedule of Valuation Techniques for Fair Value Measurements Categorized Within Level 3 (Details) - Level 3 of fair value hierarchy [Member] $ in Thousands | 12 Months Ended
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Jan. 31, 2019 NZD ($)
DisclosureOfFairValueMeasurementLineItems [Line Items] |
Balance at 31 January 2018 | $ 1,110
Conversion | (1,110)
Balance at 31 January 2019 |

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- References No definition available. + Details
Name: | NAKD_DisclosureOfFairValueMeasurementLineItems
Namespace Prefix: | NAKD_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of present obligations of the entity arising from past events, the settlement of which is expected to result in an outflow from the entity of resources embodying economic benefits. + References No definition available. + Details
Name: | NAKD_FairValueLiabilities
Namespace Prefix: | NAKD_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The decrease in the fair value measurement of liabilities resulting from settlements. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_iii&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_SettlementsFairValueMeasurementLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level3OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |