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Inventories - Disclosure of Detailed Information About Inventories (Details) - NZD ($)
$ in Thousands
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Disclosure of inventories [Abstract]      
Finished goods $ 21,564 $ 31,451 $ 37,904
Provision for impairment (444) (338) (153)
Current inventories $ 21,120 $ 31,113 $ 37,751