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Trade and Other Receivables - Disclosure of Impairment Loss and Reversal of Impairment Loss (Details) - NZD ($) $ in Thousands | 7 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2017 | Jan. 31, 2019 | Jan. 31, 2018
Trade and other receivables [abstract] |  |  |
Balance at beginning of the period (calculated in accordance with AASB 139) | $ (268) | $ (326) | $ (537)
Amount restated through opening retained earnings on adoption of AASB 9 |  |  |
Opening impairment allowance calculated under AASB 9 | (268) | (326) | (537)
Additional impairment loss recognised |  |  |
Amounts written off as uncollectable, Directly to P&L |  |  |
Amounts written off as uncollectable, Movement through provision | (364) | (1,037) | (92)
Unused amounts reversed | 80 | 772 | 316
Foreign exchange movement | 15 | (18) | (13)
Balance at end of the period | $ (537) | $ (609) | $ (326)

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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 additional impairment loss recognised. + References No definition available. + Details
Name: | NAKD_ImpairmentOfReceivablesAdditionalImpairmentLossRecognised
Namespace Prefix: | NAKD_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Impairment of receivables amount restated through opening retained earnings. + References No definition available. + Details
Name: | NAKD_ImpairmentOfReceivablesAmountRestatedThroughOpeningRetainedEarnings
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 directly to profit and loss. + References No definition available. + Details
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Namespace Prefix: | NAKD_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 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
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Balance Type: | credit
Period Type: | duration

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