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Financial Risk Management - Disclosure of Market Risk (Details) - NZD ($)
$ in Thousands
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Trade Receivables [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets $ 480 $ 378 $ 1,903
Trade Receivables [Member] | AUD [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets 51 328
Trade Receivables [Member] | US [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets 19 42 199
Trade Receivables [Member] | GBP [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets 20
Trade Receivables [Member] | EUR [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets 441 285 1,376
Trade Receivables [Member] | HKD [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets
Trade Payables [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial liabilities 4,168 9,112 12,146
Trade Payables [Member] | AUD [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial liabilities 12 1 781
Trade Payables [Member] | US [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial liabilities 4,068 9,035 11,209
Trade Payables [Member] | GBP [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial liabilities 85 8 74
Trade Payables [Member] | EUR [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial liabilities 1 61 29
Trade Payables [Member] | HKD [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial liabilities 2 7 53
Cash and Cash Equivalents [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets 2,341 829 9,184
Cash and Cash Equivalents [Member] | AUD [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets 1,500 623 1,660
Cash and Cash Equivalents [Member] | US [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets 747 149 7,190
Cash and Cash Equivalents [Member] | GBP [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets 85 38 77
Cash and Cash Equivalents [Member] | EUR [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets 5 8 92
Cash and Cash Equivalents [Member] | HKD [Member]      
Statement Line Items [Line Items]      
Foreign currency denominated financial assets $ 4 $ 11 $ 165