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COLLABORATION INVENTORIES, NET - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Classes of current inventories [abstract]
Inventory reserve	$ 12.5	$ 18.7

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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