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Other Financial Commitments - Disclosure of Detailed Information About Contracted Commitments Explanatory (Details) - NZD ($)
$ in Thousands
Jan. 31, 2021
Jan. 31, 2020
Statement Line Items [Line Items]    
Contractual capital commitments $ 5,392
Not Later than One Year [Member]    
Statement Line Items [Line Items]    
Contractual capital commitments 5,392
Between One Year and Five Years [Member]    
Statement Line Items [Line Items]    
Contractual capital commitments