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)

v3.21.1
Financial Risk Management - Disclosure of Detailed Information About Hedging Instruments (Details) - Less than Six Months [Member]
$ in Thousands
12 Months Ended
Jan. 31, 2021
NZD ($)
Integer
Jan. 31, 2020
NZD ($)
Integer
Jan. 31, 2019
NZD ($)
Integer
Buy USD / Sell NZD [Member]      
Statement Line Items [Line Items]      
Notional amounts | $ $ 34,395
Average exchange rate | Integer 0.6620
Buy AUD / Sell NZD [Member]      
Statement Line Items [Line Items]      
Notional amounts | $
Average exchange rate | Integer