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Financial Risk Management - Disclosure of Market Risk (Details) - NZD ($) $ in Thousands | Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017
--- | --- | --- | ---
Trade Receivables [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets | $ 378 | $ 1,903 | $ 2,144
Trade Receivables [Member] | AUD [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets | 51 | 328 | 424
Trade Receivables [Member] | US [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets | 42 | 199 | 211
Trade Receivables [Member] | GBP [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets |  |  |
Trade Receivables [Member] | EUR [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets | 285 | 1,376 | 1,509
Trade Receivables [Member] | HKD [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets |  |  |
Trade Payables [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial liabilities | 9,112 | 12,146 | 9,051
Trade Payables [Member] | AUD [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial liabilities | 1 | 781 | 315
Trade Payables [Member] | US [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial liabilities | 9,035 | 11,209 | 8,557
Trade Payables [Member] | GBP [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial liabilities | 8 | 74 | 131
Trade Payables [Member] | EUR [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial liabilities | 61 | 29 | 32
Trade Payables [Member] | HKD [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial liabilities | 7 | 53 | 16
Cash and Cash Equivalents [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets | 829 | 9,184 | 1,874
Cash and Cash Equivalents [Member] | AUD [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets | 623 | 1,660 | 926
Cash and Cash Equivalents [Member] | US [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets | 149 | 7,190 | 401
Cash and Cash Equivalents [Member] | GBP [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets | 38 | 77 | 131
Cash and Cash Equivalents [Member] | EUR [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets | 8 | 92 | 388
Cash and Cash Equivalents [Member] | HKD [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Foreign currency denominated financial assets | $ 11 | $ 165 | $ 28

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