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Income Tax Expense/(Benefit) - Disclosure of Detailed Information About Reconciliation of Accounting Profit Multiplied by Applicable Tax Rates (Details) - NZD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Income taxes [Abstract]      
Loss before income tax $ (53,523) $ (50,494) $ (37,533)
Tax at New Zealand tax rate of 28% (14,986) (14,138) (10,509)
Tax effect of: permanent differences (including impairment expense) 5,108 753 (105)
Tax effect of: adjustments in respect of current income tax of previous years 32 (522) (449)
Tax effect of: effects of different tax rates of subsidiaries operating in other jurisdictions (301) 493 (30)
Tax effect of: deferred tax assets relating to the current year not brought to account 10,163 12,077 11,150
Tax effect of: deferred tax assets relating to prior periods no longer recognised (note 29) 701
Tax effect of: other 65 63 3
Income tax expense/(benefit) $ 782 $ (1,274) $ 60