Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Financial Risk Management - Disclosure of Detailed Information About Hedging Instruments (Details)

v3.19.2
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