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Finance Expense - Disclosure of Detailed Information About Finance Expense (Details) - NZD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
Finance Expense |  |  |  |
Interest expense on external borrowings |  | $ 1,608 | $ 2,338 | $ 5,431
Interest expense on convertible loan notes |  | 1,425 |  |
Interest expense on leases |  | 1,674 |  |
Interest (income)/expense on shareholder loans | [1] | (165) | 1,062 | 2,807
Amortisation of loan set up costs |  | 671 | 641 | 553
Finance expense |  | $ 5,213 | $ 4,041 | $ 8,791
[1] | During the year, the shareholder loan payable was derecognised resulting in a reversal of interest expense.

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- Definition Amortisation of loan set up costs. + References No definition available. + Details
Name: | NAKD_AmortisationOfLoanSetUpCosts
Namespace Prefix: | NAKD_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Interest (income)/expense on shareholder loans. + References No definition available. + Details
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Namespace Prefix: | NAKD_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of income or cost associated with interest and other financing activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&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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- Definition The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings] + 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
Name: | ifrs-full_InterestExpenseOnBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of interest expense on debt instruments issued. [Refer: Interest expense; Debt instruments issued] + 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: | debit
Period Type: | duration

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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_b&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration