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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
 7 Months Ended 12 Months Ended
Jan. 31, 2017
Jan. 31, 2019
Jan. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at the beginning of the period $ 6,209 $ 4,741 $ 4,964
Additions 723 2,585 2,317
Disposals   (2,841) (122)
Depreciation expense (1,664) (2,152) (2,724)
Impairment loss (281) (239)  
Foreign exchange movements (23) 1,669 306
Balance at the end of the period 4,964 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 2,795 2,728 2,691
Additions 241 1,501 285
Disposals   (105) (4)
Depreciation expense (296) (982) (496)
Impairment loss  
Foreign exchange movements (49) 122 252
Balance at the end of the period 2,691 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 3,414 2,013 2,273
Additions 482 1,084 2,032
Disposals   (2,736) (118)
Depreciation expense (1,368) (1,170) (2,228)
Impairment loss (281) (239)  
Foreign exchange movements 26 1,547 54
Balance at the end of the period $ 2,273 $ 499 $ 2,013