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COVER	3 Months Ended
	Mar. 31, 2026
Cover [Abstract]
Document Type	6-K
Entity Registrant Name	Legend Biotech Corporation
Entity Central Index Key	0001801198
Document Period End Date	Mar. 31, 2026
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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