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Property, Plant and Equipment - Disclosure of Detailed Information About Property, Plant and Equipment (Details) - NZD ($)
$ in Thousands
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment $ 3,037 $ 3,763 $ 4,741
Leasehold Improvements [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 1,766 3,264 2,728
Leasehold Improvements [Member] | At Cost [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 11,456 12,035  
Leasehold Improvements [Member] | Accumulated Amortisation and Impairment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (9,690) (8,771)  
Plant, Furniture, Fittings and Motor Vehicles [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 1,271 499 $ 2,013
Plant, Furniture, Fittings and Motor Vehicles [Member] | At Cost [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 24,850 25,666  
Plant, Furniture, Fittings and Motor Vehicles [Member] | Accumulated Amortisation and Impairment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment $ (23,579) $ (25,167)