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Operating Segments - Disclosure of Detailed Information About Geographical Information (Details) - NZD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Statement Line Items [Line Items]      
Revenue $ 90,065 $ 111,920 $ 131,388
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