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Key Management Personnel Remuneration - Disclosure of Detailed Information About Key Management Personnel (Details) (Parenthetical)
$ in Thousands
12 Months Ended
Jan. 31, 2021
NZD ($)
Jan. 31, 2020
NZD ($)
Jan. 31, 2019
NZD ($)
Jan. 31, 2021
$ / shares
Key Management Personnel Remuneration        
Key management personnel remuneration $ 13,865 $ 3,182 $ 2,056  
Share-based payment $ 11,600      
Warrant exercise price | $ / shares       $ 0.37