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

Financial Risk Management - Sensitivity Analysis for Types of Market Risk (Details)

v3.21.1
Financial Risk Management - Sensitivity Analysis for Types of Market Risk (Details) - NZD ($)
$ in Thousands
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
10% Increase [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic $ 145 $ 179  
10% Decrease [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic (145) (179)  
1.00% Increase [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic 145 (145)  
1.00% Decrease [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic 179 (179)  
US [Member] | 10% Increase [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic (460) (594) $ (954)
US [Member] | 10% Decrease [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic 460 594 954
AUD [Member] | 10% Increase [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic (2) (1) (5)
AUD [Member] | 10% Decrease [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic 2 1 5
GBP [Member] | 10% Increase [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic (9) (16) (1)
GBP [Member] | 10% Decrease [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic 9 16 1
EUR [Member] | 10% Increase [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic (10) (42) (32)
EUR [Member] | 10% Decrease [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic 10 42 32
HKD [Member] | 10% Increase [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic (1)
HKD [Member] | 10% Decrease [Member]      
Statement Line Items [Line Items]      
Risk exposure associated with instruments sharing characteristic $ 1