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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, 2021 | Jan. 31, 2020 | Jan. 31, 2019
Fair value gain loss on convertible notes derivative |  |  |
Accumulated losses at the beginning of the financial year | $ (176,595) | $ (121,651) |
Adoption of IFRS 16 |  | (639) |
Profit/(loss) after income tax | (68,346) | (54,305) | $ (49,220)
Accumulated losses at end of the financial year | $ (244,941) | $ (176,595) | $ (121,651)

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