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Other Foreign Currency (Gains)/Losses - Disclosure of Detailed Information About Foreign Currency (Gains)/Losses (Details) - NZD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Other Foreign Currency Gainslosses      
Fair value (gain)/loss on foreign exchange contracts $ (729) $ 1,065 $ (502)
Net foreign exchange loss/(gain) 114 (3,027) (255)
Other foreign currency (gains)/losses $ (615) $ (1,963) $ (757)