Combined and Consolidated Statements of Earnings - USD ($) $ in Millions	12 Months Ended
	May 26, 2019	May 27, 2018	May 28, 2017
Condensed Combined and Consolidated Statements of Earnings
Net sales	$ 3,756.5	$ 3,423.7	$ 3,168.0
Net sales, type	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of sales	$ 2,753.0	$ 2,544.2	$ 2,389.2
Cost of sales, type	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 1,003.5	$ 879.5	$ 778.8
Selling, general and administrative expenses	335.1	299.4	260.5
Income from operations	668.4	580.1	518.3
Interest expense, net	107.1	108.8	61.2
Income before income taxes and equity method earnings	561.3	471.3	457.1
Income tax expense	133.6	121.2	170.2
Equity method investment earnings	59.5	83.6	53.3
Net income	487.2	433.7	340.2
Less: Income attributable to noncontrolling interests	8.6	16.9	13.3
Net income attributable to Lamb Weston Holdings, Inc.	$ 478.6	$ 416.8	$ 326.9
Earnings per share
Basic (in dollars per share)	$ 3.19	$ 2.83	$ 2.22
Diluted (in dollars per share)	$ 3.18	$ 2.82	$ 2.22