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Income Tax Expense/(Benefit) - Disclosure of Detailed Information About Temporary Differences Not Recognised (Details) - NZD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Income taxes [Abstract]      
Temporary differences for which no deferred tax asset has been recognised $ 9,825 $ 14,504 $ 14,661
Potential tax benefit at 28% $ 2,751 $ 4,061 $ 4,105