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Capital and Leasing Commitments - Disclosure of Detailed Information About Contracted Commitments Explanatory (Details) - NZD ($) $ in Thousands | Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017
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DisclosureOfCapitalAndLeasingCommitmentsLineItems [Line Items] |  |  |
Contractual capital commitments | $ 12,982 | $ 15,806 | $ 19,569
Not Later than One Year [Member] |  |  |
DisclosureOfCapitalAndLeasingCommitmentsLineItems [Line Items] |  |  |
Contractual capital commitments | 4,286 | 3,797 | 3,652
Between One Year and Five Years [Member] |  |  |
DisclosureOfCapitalAndLeasingCommitmentsLineItems [Line Items] |  |  |
Contractual capital commitments | $ 8,696 | $ 12,009 | $ 15,917

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- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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