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FINANCE INCOME AND FINANCE COSTS - Summary of Finance Costs (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Finance Income And Finance Costs [Abstract] |  |
Interest on lease liabilities | $ 499 | $ 416
Collaboration interest-bearing advanced funding | 4,562 | 5,059
Total | $ 5,061 | $ 5,475

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- Definition The amount of costs associated with financing activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 82 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_82_b&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_b&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | debit
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