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Intangible Assets - Disclosure of Detailed Information About Impairment of Indefinite-lived Brand Intangibles (Details)
$ in Thousands
 6 Months Ended
Jul. 31, 2020
NZD ($)
Disclosure of detailed information about intangible assets [abstract]  
33 basis points increase in discount rate $ (164)
70 basis points decrease in long-term sales growth (66)
500 basis points decrease in long-term sales forecast $ (318)