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Accumulated Losses - Disclosure of Detailed Information About Retained Earnings Accumulated Losses (Details) - NZD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2020 | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
Fair value gain loss on convertible notes derivative |  |  |  |  |  |
Accumulated losses at the beginning of the financial year |  |  | $ (121,651) |  | $ (72,431) |
Impact of IFRS 16 |  |  | (639) |  |  |
Loss for the period | $ (54,305) |  | (54,305) |  | (49,220) | $ (37,593)
Accumulated losses at end of the financial year | $ (176,595) | [1] | $ (176,595) | [1] | $ (121,651) | $ (72,431)
[1] | Includes $639k opening adjustment loss at the date of adoption.

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