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Financial Risk Management - Disclosure of Financial Assets (Details) - NZD ($)
$ in Thousands
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Disclosure of Financial Risk Management [Abstract]        
Cash and cash equivalents $ 90,925 $ 3,791 $ 1,962 $ 10,739
Trade receivables 1,462 2,336    
Financial assets $ 92,387 $ 6,127