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Financial Risk Management - Sensitivity Analysis for Types of Market Risk (Details) - NZD ($) $ in Thousands | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
--- | --- | --- | ---
10% Increase [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic | $ 179 | $ 200 |
10% Decrease [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic | (179) | (200) |
US [Member] | 10% Increase [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic | (594) | (954) | $ (1,509)
US [Member] | 10% Decrease [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic | 594 | 954 | 1,509
AUD [Member] | 10% Increase [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic | (1) | (5) | (805)
AUD [Member] | 10% Decrease [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic | 1 | 5 | 805
GBP [Member] | 10% Increase [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic | (16) | (1) | (175)
GBP [Member] | 10% Decrease [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic | 16 | 1 | 175
EUR [Member] | 10% Increase [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic | (42) | (32) | (136)
EUR [Member] | 10% Decrease [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic | 42 | 32 | 136
HKD [Member] | 10% Increase [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic |  | (1) | (14)
HKD [Member] | 10% Decrease [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk exposure associated with instruments sharing characteristic |  | $ 1 | $ 14

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- Definition Statement Line Items. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]] + References No definition available. + Details
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Namespace Prefix: | NAKD_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |