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Intangible Assets - Disclosure of Detailed Information about Intangible Assets (Details) - NZD ($) $ in Thousands | Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017 | Jun. 30, 2016
--- | --- | --- | --- | ---
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | $ 37,864 | $ 13,012 | $ 14,680 | $ 14,575
Goodwill [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | 2,320 |  |  |
Goodwill [Member] | At Cost [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | 5,607 |  |  |
Goodwill [Member] | Impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | (3,287) |  |  |
Patents and Licences [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | 25,075 | 201 | 596 | 274
Patents and Licences [Member] | At Cost [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | 25,993 | 919 | 1,169 |
Patents and Licences [Member] | Accumulated amortisation and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | (918) | (718) | (573) |
Brand [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | 10,205 | 12,463 | 12,036 | 12,105
Brand [Member] | At Cost [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | 14,769 | 12,463 | 12,036 |
Brand [Member] | Accumulated amortisation and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | (4,563) |  |  |
Software [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | 263 | 348 | 2,048 | $ 2,196
Software [Member] | At Cost [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | 15,718 | 15,788 | 17,308 |
Software [Member] | Accumulated amortisation and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total intangible assets and goodwill | $ (15,455) | $ (15,440) | $ (15,260) |

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- Definition The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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