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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, 2021
Jan. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Opening Balance $ 692
Charged to Income (701)
Charged directly to Equity
Changes in Tax Rate
Exchange Differences 9
Closing Balance
Carried Forward Tax Losses [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Opening Balance 630 1,322
Charged to Income (701)
Charged directly to Equity
Changes in Tax Rate
Exchange Differences 9
Closing Balance 630 630
Intangible Assets [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Opening Balance (630) (630)
Charged to Income
Charged directly to Equity
Changes in Tax Rate
Exchange Differences
Closing Balance $ (630) $ (630)