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Auditor's Remuneration - Schedule of Auditor Remuneration (Details) - NZD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Statement Line Items [Line Items]      
Total remuneration $ 679 $ 1,050 $ 513
Pricewaterhouse Coopers Australia [Member]      
Statement Line Items [Line Items]      
Audit fees 477 485
Taxation fees/services 33
Other 10 403
Total remuneration 10 913 485
Network firms of Pricewaterhouse Coopers Australia [Member]      
Statement Line Items [Line Items]      
Taxation fees/services 137 28
BDO Audit Pty Ltd Australia [Member]      
Statement Line Items [Line Items]      
Audit fees 403
Other 266
Total remuneration $ 669