SEGMENTS - General Financial Information (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 27, 2017	Aug. 28, 2016
Revenue information
Net sales	$ 817.5	$ 776.3
Product contribution margin	193.3	175.9
Equity method investment earnings	20.0	10.6
Total product contribution margin plus equity method investment earnings	213.3	186.5
Other selling, general and administrative expenses	55.7	50.9
Interest expense, net	25.2	1.5
Income tax expense	44.1	51.0
Net income	88.3	83.1
Less: Income attributable to noncontrolling interests	4.9	3.5
Net income attributable to Lamb Weston Holdings, Inc.	83.4	79.6
Pretax professional fees expenses	2.2	9.7
Global
Revenue information
Net sales	413.9	399.2
Product contribution margin	74.7	73.7
Foodservice
Revenue information
Net sales	279.4	260.2
Product contribution margin	90.9	79.4
Retail
Revenue information
Net sales	92.0	89.6
Product contribution margin	16.5	19.6
Other
Revenue information
Net sales	32.2	27.3
Product contribution margin	$ 11.2	$ 3.2