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COLLABORATION INVENTORIES, NET - Additional Information (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Classes of current inventories [abstract] |  |
Inventory reserve | $ 17.9 | $ 21.7

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- References No definition available. + Details
Name: | ifrs-full_ClassesOfInventoriesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Inventory reserve + References No definition available. + Details
Name: | legn_InventoryReserve
Namespace Prefix: | legn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant