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Changes in Accounting Policies (Tables)
 12 Months Ended
Jan. 31, 2020
Changes In Accounting Policies  
Disclosure of Detailed Information About Impact of Adoption of IFRS 16

    1 February 2019  
    $’000  
Right-of-use assets     26,158  
Lease contribution provision     1,102  
Lease liabilities     (27,899 )
Net reduction in retained earnings     639