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Dividends - Disclosure of Detailed Information About Dividends Explanatory (Details) (Parenthetical) | 12 Months Ended
--- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
Statement Line Items [Line Items] |  |  |
Applicable tax rate | 28.00% | 28.00% | 28.00%
Australian Franking Credits [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Tax rate effect of foreign tax rates | 30.00% | 30.00% |
New Zealand Imputation Credits [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Applicable tax rate | 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 2019-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2019-03-27 + Details
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