Document and Entity Information - shares	3 Months Ended
	Sep. 26, 2015	Oct. 24, 2015
Document And Entities Information [Abstract]
Entity Registrant Name	Lumentum Holdings Inc.
Entity Central Index Key	0001633978
Document Type	10-Q
Document Fiscal Period Focus	Q1
Document Period End Date	Sep. 26, 2015
Amendment Flag	false
Current Fiscal Year End Date	--06-27
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		58,975,368
Document Fiscal Year Focus	2016