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

Fair Value Measurement - Schedule of Fair Value Measurement of Assets and Liabilities (Details)

v3.19.2
Fair Value Measurement - Schedule of Fair Value Measurement of Assets and Liabilities (Details) - Recurring fair value measurement [Member] - NZD ($)
$ in Thousands
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Derivative on Convertible Notes [Member]      
DisclosureOfFairValueMeasurementLineItems [Line Items]      
Financial liabilities $ 1,110 $ 4,112
Foreign exchange contracts [Member]      
DisclosureOfFairValueMeasurementLineItems [Line Items]      
Financial assets
Financial liabilities 1,484 2,087 4,188
Level 1 of fair value hierarchy [Member] | Derivative on Convertible Notes [Member]      
DisclosureOfFairValueMeasurementLineItems [Line Items]      
Financial liabilities
Level 1 of fair value hierarchy [Member] | Foreign exchange contracts [Member]      
DisclosureOfFairValueMeasurementLineItems [Line Items]      
Financial assets
Financial liabilities
Level 2 of fair value hierarchy [member] | Derivative on Convertible Notes [Member]      
DisclosureOfFairValueMeasurementLineItems [Line Items]      
Financial liabilities
Level 2 of fair value hierarchy [member] | Foreign exchange contracts [Member]      
DisclosureOfFairValueMeasurementLineItems [Line Items]      
Financial assets
Financial liabilities 1,484 2,087 4,188
Level 3 of fair value hierarchy [Member] | Derivative on Convertible Notes [Member]      
DisclosureOfFairValueMeasurementLineItems [Line Items]      
Financial assets    
Financial liabilities 1,110
Level 3 of fair value hierarchy [Member] | Foreign exchange contracts [Member]      
DisclosureOfFairValueMeasurementLineItems [Line Items]      
Financial assets  
Financial liabilities $ 4,112