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Tax Assets and Liabilities - Reconciliation of Changes in Deferred Tax Liability Asset (Details) - NZD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Opening Balance $ 692
Charged to Income [1] (692) 692
Charged directly to Equity  
Changes in Tax Rate  
Exchange Differences  
Closing Balance 692
Carried Forward Tax Losses [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Opening Balance 1,322 630
Charged to Income [1] (692) 692
Charged directly to Equity
Changes in Tax Rate
Exchange Differences
Closing Balance 630 1,322
Intangible Assets [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Opening Balance (630) (630)
Charged to Income [1]
Charged directly to Equity
Changes in Tax Rate  
Exchange Differences
Closing Balance $ (630) $ (630)
[1] There is a foreign currency impact of $9k which is not reflected in the table above. The total amount charged to the profit and loss account is $701k (note 10).