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Financial Risk Management - Disclosure of Financial Instruments by Type of Interest Rate (Details) - NZD ($)
$ in Thousands
Jan. 31, 2020
Jan. 31, 2019
Statement Line Items [Line Items]    
Total $ 38,913 $ 20,967
Floating Rate Instruments [Member]    
Statement Line Items [Line Items]    
Bank overdrafts
Working capital financing bank facility
Convertible notes
Borrowings 17,900 20,000
Total $ 17,900 $ 20,000