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FINANCE INCOME AND FINANCE COSTS - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Finance Income And Finance Costs [Abstract]
Finance income	[1]	$ 12,056	$ 13,870
[1] Certain prior year amounts have been reclassified to present finance income as a separate line item and to combine other income/(expense), net for comparative purposes

X

- Definition

The amount of income associated with interest and other financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 85
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard
-URIDate 2024-03-27

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Finance Costs [Abstract]

+ References

No definition available.

+ Details

Name:	legn_FinanceIncomeAndFinanceCostsAbstract
Namespace Prefix:	legn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration