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Financial Risk Management - Disclosure of Detailed Information About Hedging Instruments (Details) $ in Thousands | 12 Months Ended
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Jan. 31, 2020 NZD ($) Integer | Jan. 31, 2019 NZD ($) Integer | Jan. 31, 2018 NZD ($) Integer
Statement Line Items [Line Items] |  |  |
Notional amount | $ 19,700 |  |
Buy USD / Sell NZD [Member] | Less than Six Months [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Notional amount |  | $ 34,395 | $ 48,149
Average foreign exchange rate | Integer |  | 0.6620 | 0.7061
Buy AUD / Sell NZD [Member] | Less than Six Months [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Notional amount |  |  | $ 2,247
Average foreign exchange rate | Integer |  |  | 0.8900

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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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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