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Right-of-Use Assets - Disclosure of Detailed Information About Right-of-Use Assets (Details) - NZD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Statement Line Items [Line Items]      
Balance as at 1 February    
Additions to right-of-use-assets 6,327    
Depreciation charge for the year (8,676)
Balance at 31 January 2020 23,809  
Land and buildings [member]      
Statement Line Items [Line Items]      
Balance as at 1 February 25,616    
Additions to right-of-use-assets 6,255    
Depreciation charge for the year (8,479)    
Balance at 31 January 2020 23,392 25,616  
Plant, Furniture, Fittings and Motor Vehicles [Member]      
Statement Line Items [Line Items]      
Balance as at 1 February 542    
Additions to right-of-use-assets 72    
Depreciation charge for the year (197)    
Balance at 31 January 2020 $ 417 $ 542