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Financial Risk Management - Disclosure of Financial Instruments by Type of Interest Rate (Details) - NZD ($)
$ in Thousands
Jan. 31, 2021
Jan. 31, 2020
Statement Line Items [Line Items]    
Borrowings $ 1,315
Total 17,495 38,913
Floating Rate Instruments [Member]    
Statement Line Items [Line Items]    
Bank overdrafts
Working capital financing bank facility
Convertible notes
Borrowings 14,500 17,900
Total $ 14,500 $ 17,900