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Trade and Other Receivables - Disclosure of Impairment Loss and Reversal of Impairment Loss (Details) - NZD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2020 | Jan. 31, 2019
Trade and other receivables [abstract] |  |
Balance at beginning of the period (calculated in accordance with IAS 139) | $ (609) | $ (326)
Opening impairment allowance calculated under IFRS 9 | (609) | (326)
Movement through provision | (4) | (1,037)
Unused amounts reversed | 616 | 772
Foreign exchange movement | (25) | (18)
Balance at end of the period | $ (22) | $ (609)

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- Definition Impairment of receivables. + References No definition available. + Details
Name: | NAKD_ImpairmentOfReceivables
Namespace Prefix: | NAKD_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Impairment of receivables amounts written off as uncollectable movement through provision. + References No definition available. + Details
Name: | NAKD_ImpairmentOfReceivablesAmountsWrittenOffAsUncollectableMovementThroughProvision
Namespace Prefix: | NAKD_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Impairment of receivables foreign exchange movement. + References No definition available. + Details
Name: | NAKD_ImpairmentOfReceivablesForeignExchangeMovement
Namespace Prefix: | NAKD_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Opening impairment allowance calculated. + References No definition available. + Details
Name: | NAKD_ImpairmentOfReceivablesOpeningImpairmentAllowance
Namespace Prefix: | NAKD_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of reversal of impairment loss recognised in profit or loss for trade receivables. [Refer: Reversal of impairment loss recognised in profit or loss; Trade receivables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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