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Financial Risk Management - Disclosure of Detailed Information About Hedging Instruments (Details) $ in Thousands | 7 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2017 NZD ($) Integer | Jan. 31, 2019 NZD ($) Integer | Jan. 31, 2018 NZD ($) Integer
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Notional amount |  |  |
Buy USD / Sell NZD [Member] | Less than Six Months [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Notional amount | $ 47,292 | $ 34,395 | $ 48,149
Average foreign exchange rate | Integer | 0.6687 | 0.6620 | 0.7061
Buy USD / Sell NZD [Member] | Six Months to One Year [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Notional amount | $ 3,479 |  |
Average foreign exchange rate | Integer | 0.7186 |  |
Buy AUD / Sell NZD [Member] | Less than Six Months [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Notional amount | $ 2,250 |  | $ 2,247
Average foreign exchange rate | Integer | 0.8890 |  | 0.8900
Buy GBP / Sell NZD [Member] | Less than Six Months [Member] |  |  |
DisclosureOfFinancialRiskManagementLineItems [Line Items] |  |  |
Notional amount | $ 1,000 |  |
Average foreign exchange rate | Integer | 0.5784 |  |

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + 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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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + 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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