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Income Tax Expense/(Benefit) - Disclosure of Detailed Information About Tax Losses Not Recognised (Details) - NZD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Income taxes [Abstract]
Unused tax losses for which no deferred tax asset has been recognised	$ 177,275	$ 166,882	$ 130,587
Potential tax benefit at 28%	$ 49,637	$ 46,727	$ 36,564

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- References

No definition available.

+ Details

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- Definition

The amount of potential tax benefit in connection with tax losses not recognized.

+ References

No definition available.

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- Definition

The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2020-01-01

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