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Financial Risk Management - Disclosure of Market Risk (Details) - NZD ($) $ in Thousands | Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019
--- | --- | --- | ---
Trade Receivables [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial assets | $ 101 | $ 480 | $ 378
Trade Receivables [Member] | AUD [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial assets |  |  | 51
Trade Receivables [Member] | US [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial assets | (2) | 19 | 42
Trade Receivables [Member] | GBP [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial assets | 13 | 20 |
Trade Receivables [Member] | EUR [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial assets | 90 | 441 | 285
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 | 761 | 4,168 | 9,112
Trade Payables [Member] | AUD [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial liabilities | 20 | 12 | 1
Trade Payables [Member] | US [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial liabilities | 741 | 4,068 | 9,035
Trade Payables [Member] | GBP [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial liabilities |  | 85 | 8
Trade Payables [Member] | EUR [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial liabilities |  | 1 | 61
Trade Payables [Member] | HKD [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial liabilities |  | 2 | 7
Cash and Cash Equivalents [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial assets | 88,552 | 2,341 | 829
Cash and Cash Equivalents [Member] | AUD [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial assets | 9,943 | 1,500 | 623
Cash and Cash Equivalents [Member] | US [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial assets | 78,506 | 747 | 149
Cash and Cash Equivalents [Member] | GBP [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial assets | 89 | 85 | 38
Cash and Cash Equivalents [Member] | EUR [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial assets | 12 | 5 | 8
Cash and Cash Equivalents [Member] | HKD [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Foreign currency denominated financial assets | $ 2 | $ 4 | $ 11

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