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Accumulated Losses - Disclosure of Detailed Information About Retained Earnings Accumulated Losses (Details) - NZD ($)
$ in Thousands
 12 Months Ended
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.