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Financial Risk Management - Sensitivity Analysis for Types of Market Risk (Details) - NZD ($) $ in Thousands | Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017 | Jun. 30, 2016 | Jun. 30, 2015
--- | --- | --- | --- | --- | ---
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Equity | $ 10,519 | $ (5,710) | $ (9,044) | $ (17,876) | $ 2,839
10% Increase [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | 200 | 402 | 642 |  |
10% Decrease [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | (200) | (402) | (642) |  |
US [Member] | 10% Increase [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | (954) | (1,509) | (1,196) |  |
US [Member] | 10% Decrease [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | 954 | 1,509 | 1,196 |  |
AUD [Member] | 10% Increase [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | (5) | (805) | 86 |  |
AUD [Member] | 10% Decrease [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | 5 | 805 | (86) |  |
GBP [Member] | 10% Increase [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | (1) | (175) | 34 |  |
GBP [Member] | 10% Decrease [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | 1 | 175 | (34) |  |
EUR [Member] | 10% Increase [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | (32) | (136) | 186 |  |
EUR [Member] | 10% Decrease [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | 32 | 136 | (186) |  |
HKD [Member] | 10% Increase [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | (1) | (14) | 1 |  |
HKD [Member] | 10% Decrease [Member] |  |  |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic | $ 1 | $ 14 | $ (1) |  |

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