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Derivative on Convertible Notes (Tables)
12 Months Ended
Jan. 31, 2019
Disclosure Of Derivative On Convertible Notes [Abstract]  
Disclosure of Detailed Information About Derivative on Convertible Notes

    31 January 2019 
NZ$000’s
    31 January 2018 
NZ$000’s
    31 January 2017 
NZ$000’s
 
Derivative on Convertible Notes     -       1,110       4,112