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FINANCE INCOME AND FINANCE COSTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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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

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- 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

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- Definition Finance Costs [Abstract] + References No definition available. + Details
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Namespace Prefix: | legn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration