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Cash Flow Information - Schedule of Non-cash Investing and Financing Activities (Details) - NZD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Cash Flow Information      
Shares issued in lieu of inventory payment $ 15,525
Shares issued in lieu of agreed debt 5,701
Shares issued on conversion of debt 1,689
Warrants issued 371
Non-cash investing and financing activities $ 7,192 $ 15,896