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Trade and Other Receivables - Disclosure of Impairment of Receivable (Details) - NZD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Statement Line Items [Line Items]    
Gross carrying amount ($) $ 2,358 $ 7,789
ECL provision $ 22  
0 - 30 Days [Member]    
Statement Line Items [Line Items]    
Expected loss rate (%) 0.00%  
Gross carrying amount ($) $ 2,039 5,577
ECL provision  
31 - 60 Days [Member]    
Statement Line Items [Line Items]    
Expected loss rate (%) 0.00%  
Gross carrying amount ($) $ 247 $ 852
ECL provision  
61 - 90 Days [Member]    
Statement Line Items [Line Items]    
Expected loss rate (%) 0.00%  
Gross carrying amount ($) $ 50  
ECL provision  
> 90 Days [Member]    
Statement Line Items [Line Items]    
Expected loss rate (%) 100.00%  
Gross carrying amount ($) $ 22  
ECL provision $ 22