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Finance Expense - Disclosure of Detailed Information About Finance Expense (Details) - NZD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Finance Expense      
Interest expense on external borrowings $ 1,608 $ 2,338 $ 5,431
Interest expense on convertible loan notes 1,425
Interest expense on leases 1,674
Interest (income)/expense on shareholder loans [1] (165) 1,062 2,807
Amortisation of loan set up costs 671 641 553
Finance expense $ 5,213 $ 4,041 $ 8,791
[1] During the year, the shareholder loan payable was derecognised resulting in a reversal of interest expense.