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Capital and Leasing Commitments (Tables)
12 Months Ended
Jan. 31, 2019
Disclosure of capital and leasing commitments [Abstract]  
Disclosure of Detailed Information About Operating Leases Explanatory

    31 January 2019 
NZ$000’s
    31 January 2018 
NZ$000’s
    31 January 2017 
NZ$000’s
 
Minimum lease payments under non-cancellable operating leases:                        
- not later than one year     8,533       9,618       9,472  
- between one year and five years     18,039       14,943       14,435  
- later than five years     1,485       528       59  
      28,057       25,089       23,966  

Disclosure of Detailed Information About Contracted Commitments Explanatory

    31 January 2019 
NZ$000’s
    31 January 2018 
NZ$000’s
    31 January 2017 
NZ$000’s
 
Licence contract                        
- not later than one year     4,286       3,797       3,652  
- between one year and five years     8,696       12,009       15,917  
      12,982       15,806       19,569