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Right-of-Use Assets - Disclosure of Amounts Recognised in Profit or Loss (Details) - NZD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Right-of-use Assets      
Interest of lease liabilities (Note 6b) $ 1,405 $ 1,674