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Fair Value Measurement - Schedule of Fair Value Measurement of Assets and Liabilities (Details) - Recurring fair value measurement [Member] - NZD ($)
$ in Thousands
Jan. 31, 2020
Jan. 31, 2019
Derivative on Convertible Notes [Member]    
Statement Line Items [Line Items]    
Financial liabilities
Foreign Exchange Contracts [Member]    
Statement Line Items [Line Items]    
Financial assets
Financial liabilities 1,484
Level 1 of fair value hierarchy [Member] | Derivative on Convertible Notes [Member]    
Statement Line Items [Line Items]    
Financial liabilities
Level 1 of fair value hierarchy [Member] | Foreign Exchange Contracts [Member]    
Statement Line Items [Line Items]    
Financial assets
Financial liabilities
Level 2 of fair value hierarchy [member] | Derivative on Convertible Notes [Member]    
Statement Line Items [Line Items]    
Financial liabilities
Level 2 of fair value hierarchy [member] | Foreign Exchange Contracts [Member]    
Statement Line Items [Line Items]    
Financial assets
Financial liabilities 1,484
Level 3 of fair value hierarchy [Member] | Derivative on Convertible Notes [Member]    
Statement Line Items [Line Items]    
Financial liabilities
Level 3 of fair value hierarchy [Member] | Foreign Exchange Contracts [Member]    
Statement Line Items [Line Items]    
Financial assets
Financial liabilities