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Property, Plant and Equipment - Disclosure of Detailed Information About Movements in Carrying Amounts of Property, Plant and Equipment (Details) - NZD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at the beginning of the period $ 3,763 $ 4,741  
Additions 1,294 2,585  
Disposals (352) (2,841)  
Depreciation expense (1,338) (2,151) $ (2,724)
Reclassification 50    
Impairment loss (491) (281)  
Adjustment to make good asset 14    
Foreign exchange movements 97 1,669  
Balance at the end of the year 3,037 3,763 4,741
Leasehold Improvements [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at the beginning of the period 3,264 2,728  
Additions 191 1,501  
Disposals (28) (105)  
Depreciation expense (461) (982)  
Reclassification (1,070)    
Impairment loss (213)  
Adjustment to make good asset 14    
Foreign exchange movements 69 122  
Balance at the end of the year 1,766 3,264 2,728
Plant, Furniture, Fittings and Motor Vehicles [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at the beginning of the period 499 2,013  
Additions 1,103 1,084  
Disposals (324) (2,736)  
Depreciation expense (877) (1,170)  
Reclassification 1,120    
Impairment loss (278) (239)  
Adjustment to make good asset    
Foreign exchange movements 28 1,547  
Balance at the end of the year $ 1,271 $ 499 $ 2,013