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

Financial Risk Management - Disclosure of Credit Risk Exposure (Details)

v3.19.2
Financial Risk Management - Disclosure of Credit Risk Exposure (Details) - NZD ($)
$ in Thousands
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Without External Credit Ratings [Member]      
DisclosureOfFinancialRiskManagementLineItems [Line Items]      
Financial assets $ 1,915 $ 10,685 $ 2,644
Without External Credit Ratings [Member] | Trade Receivables [Member]      
DisclosureOfFinancialRiskManagementLineItems [Line Items]      
Financial assets 7,789 9,982 26,499
Without External Credit Ratings [Member] | Trade Receivables [Member] | New Customer Less than 6 Months [Member]      
DisclosureOfFinancialRiskManagementLineItems [Line Items]      
Financial assets 42 12 187
Without External Credit Ratings [Member] | Trade Receivables [Member] | Existing Customers (More Than 6 Months With Default in Past [Member]      
DisclosureOfFinancialRiskManagementLineItems [Line Items]      
Financial assets 7,747 9,970 26,312
Ratings AA- [Member]      
DisclosureOfFinancialRiskManagementLineItems [Line Items]      
Financial assets 1,915 10,591 2,655
Ratings A+ [Member]      
DisclosureOfFinancialRiskManagementLineItems [Line Items]      
Financial assets $ 94 $ (11)