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Dividends - Disclosure of Detailed Information About Dividends Explanatory (Details) - NZD ($) $ in Thousands | Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017
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Australian Franking Credits [Member] |  |  |
DisclosureOfDividendsLineItems [Line Items] |  |  |
Unused tax credits for which no deferred tax asset recognised | $ 3,995 | $ 3,995 | $ 3,757
New Zealand Imputation Credits [Member] |  |  |
DisclosureOfDividendsLineItems [Line Items] |  |  |
Unused tax credits for which no deferred tax asset recognised | $ 236 | $ 236 | $ 235

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