Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	May 28, 2017	Jul. 17, 2017	Nov. 27, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	Lamb Weston Holdings, Inc.
Entity Central Index Key	0001679273
Document Type	10-K
Document Period End Date	May 28, 2017
Amendment Flag	false
Current Fiscal Year End Date	--05-28
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Filer Category	Non-accelerated Filer
Entity Public Float			$ 4,760
Entity Common Stock, Shares Outstanding		146,104,057
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY