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Revenue and Other Income - Disclosure of Detailed Information About Revenue from Continuing Operations (Details) - NZD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Statement Line Items [Line Items]      
Gross revenue $ 93,302 $ 120,278 $ 145,452
Rebates (3,237) (8,358) (14,064)
Revenue 90,065 111,920 131,388
Sale of goods 90,065 111,920 131,285
Other income 103
New Zealand [Member]      
Statement Line Items [Line Items]      
Revenue 33,786 40,703 46,665
Australia [Member]      
Statement Line Items [Line Items]      
Revenue 24,365 32,065 38,208
United States [Member]      
Statement Line Items [Line Items]      
Revenue 30,863 34,156 32,323
Europe [Member]      
Statement Line Items [Line Items]      
Revenue 1,051 4,996 14,192
Retail [Member]      
Statement Line Items [Line Items]      
Sale of goods 42,576 50,443 53,150
Wholesale [Member]      
Statement Line Items [Line Items]      
Sale of goods 15,553 29,394 45,901
Online [Member]      
Statement Line Items [Line Items]      
Sale of goods $ 31,936 $ 32,083 $ 32,234