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Provisions - Disclosure of Detailed Information About Reconciliation of Changes in Other Provisions (Details) - NZD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
DisclosureOfProvisionsLineItems [Line Items]    
Opening balance $ 3,293 $ 3,817
Impact of IFRS 16 [1] (1,102)  
Additional provisions recognised 5,512 1,054
Unused amounts reversed   (600)
Unwinding of discounts   (84)
Amounts used during the period (80) (774)
Exchange differences 1 (120)
Ending Balance 7,640 3,293
Lease Contributions Provision [Member]    
DisclosureOfProvisionsLineItems [Line Items]    
Opening balance 1,085 1,322
Impact of IFRS 16 [1] (1,102)  
Additional provisions recognised 337
Unused amounts reversed  
Unwinding of discounts  
Amounts used during the period (510)
Exchange differences 17 (64)
Ending Balance 1,085
Other Provision [Member]    
DisclosureOfProvisionsLineItems [Line Items]    
Opening balance 264
Impact of IFRS 16 [1]  
Additional provisions recognised 5,205
Unused amounts reversed  
Unwinding of discounts  
Amounts used during the period (264)
Exchange differences
Ending Balance 5,205
Make Good Provision [Member]    
DisclosureOfProvisionsLineItems [Line Items]    
Opening balance 2,208 2,231
Impact of IFRS 16 [1]  
Additional provisions recognised 307 717
Unused amounts reversed   (600)
Unwinding of discounts   (84)
Amounts used during the period (64)
Exchange differences (16) (56)
Ending Balance $ 2,435 $ 2,208
[1] There is a $17k foreign exchange difference relating to the impact of IFRS16 that is not reflected in the table in note 3 which does not materially affect the opening adjustment at date of adoption.