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Auditor's Remuneration - Schedule of Auditor Remuneration (Details) - NZD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Statement Line Items [Line Items]      
Total remuneration $ 743 $ 679 $ 1,050
Pricewaterhouse Coopers Australia [Member]      
Statement Line Items [Line Items]      
Audit fees 477
Taxation fees 33
Other 10 403
Total remuneration 10 913
Network firms of Pricewaterhouse Coopers Australia [Member]      
Statement Line Items [Line Items]      
Taxation fees 137
BDO Audit Pty Ltd Australia [Member]      
Statement Line Items [Line Items]      
Audit fees 593 403
Other 150 266
Total remuneration $ 743 $ 669 $ 1,050