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Intangible Assets - Disclosure of Information for Cash-generating Units (Details) - NZD ($)
$ in Thousands
6 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Disclosure of detailed information about intangible assets [line items]    
Impairment of expense $ 2,480
United States [Member]    
Disclosure of detailed information about intangible assets [line items]    
Impairment of expense $ 2,480