Combined and Consolidated Statements of Earnings - USD ($) $ in Millions	3 Months Ended
	Aug. 26, 2018	Aug. 27, 2017
Condensed Combined and Consolidated Statements of Earnings
Net sales	$ 914.9	$ 817.5
Net sales, type	us-gaap:ProductMember	us-gaap:ProductMember
Cost of sales	$ 684.3	$ 621.2
Cost of sales, type	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 230.6	$ 196.3
Selling, general and administrative expenses	78.0	58.7
Income from operations	152.6	137.6
Interest expense, net	26.8	25.2
Income before income taxes and equity method earnings	125.8	112.4
Income tax expense	34.3	44.1
Equity method investment earnings	19.9	20.0
Net income	111.4	88.3
Less: Income attributable to noncontrolling interests	3.6	4.9
Net income attributable to Lamb Weston Holdings, Inc.	$ 107.8	$ 83.4
Earnings per share
Basic (in dollars per share)	$ 0.73	$ 0.56
Diluted (in dollars per share)	0.73	0.56
Dividends declared per common share (in dollars per share)	$ 0.19125	$ 0.18750