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Trade and Other Receivables - Analysis of Age of Financial Assets That are Past Due but Not Impaired (Details) - NZD ($)
$ in Thousands
Jan. 31, 2020
Jan. 31, 2019
Statement Line Items [Line Items]    
Trade receivables $ 2,358 $ 7,789
0 - 30 Days [Member]    
Statement Line Items [Line Items]    
Trade receivables 2,039 5,577
31 - 60 Days [Member]    
Statement Line Items [Line Items]    
Trade receivables 247 852
61 - 90 Days [Member]    
Statement Line Items [Line Items]    
Trade receivables 50  
61 - 90 Days [Member] | Past Due Not Impaired [Member]    
Statement Line Items [Line Items]    
Trade receivables 50 101
> 90 Days [Member]    
Statement Line Items [Line Items]    
Trade receivables 22  
> 90 Days [Member] | Past Due Not Impaired [Member]    
Statement Line Items [Line Items]    
Trade receivables 3,295
> 90 Days [Member] | Considered Impaired [Member]    
Statement Line Items [Line Items]    
Trade receivables $ 22 $ (2,036)