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Dividends - Disclosure of Detailed Information About Dividends Explanatory (Details) - NZD ($)
$ in Thousands
Jan. 31, 2021
Jan. 31, 2020
Australian Franking Credits [Member]    
Statement Line Items [Line Items]    
Unused tax credits for which no deferred tax asset recognised $ 3,995 $ 3,995
New Zealand Imputation Credits [Member]    
Statement Line Items [Line Items]    
Unused tax credits for which no deferred tax asset recognised $ 236 $ 236