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Borrowings - Disclosure of Detailed Information About Borrowings (Details) - NZD ($)
$ in Thousands
Jan. 31, 2020
Jan. 31, 2019
Statement Line Items [Line Items]    
Current borrowings $ 19,215 $ 20,967
Convertible loan notes  
Non-current borrowings 19,698
Current and noncurrent borrowings 38,913 20,967
Amounts Due in Less Than One Year [Member]    
Statement Line Items [Line Items]    
Bank Loans 17,900 20,000
Debt issuance costs in relation to bank loan (270)
Other loan 1,315 1,237
Amounts Due After More Than One Year [Member]    
Statement Line Items [Line Items]    
Convertible loan notes $ 19,698