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Dividends - Disclosure of Detailed Information About Dividends Explanatory (Details) (Parenthetical) | 7 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2017 | Jan. 31, 2019 | Jan. 31, 2018 | Jun. 30, 2016
DisclosureOfDividendsLineItems [Line Items] |  |  |  |
Applicable tax rate | 28.00% | 28.00% | 28.00% | 28.00%
Australian Franking Credits [Member] |  |  |  |
DisclosureOfDividendsLineItems [Line Items] |  |  |  |
Tax rate effect of foreign tax rates | 30.00% | 30.00% | 30.00% |
New Zealand imputation credits [Member] |  |  |  |
DisclosureOfDividendsLineItems [Line Items] |  |  |  |
Applicable tax rate | 28.00% | 28.00% | 28.00% |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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