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Intangible Assets - Disclosure of Information for Cash-generating Units (Details) - NZD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Impairment expense $ 2,320
United States [Member]      
Disclosure of detailed information about intangible assets [line items]      
Impairment expense $ 2,320