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Tax Assets and Liabilities - Reconciliation of Changes in Deferred Tax Liability Asset (Details) (Parenthetical) - NZD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]      
Foreign currency impact $ 9 $ 9  
Profit and loss of deferred tax assets/(liabilities) $ 701