SEGMENTS - General Financial Information (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 25, 2019	Aug. 26, 2018
Segment information
Net sales	$ 989.0	$ 914.9
Product contribution margin	243.8	224.2
Other selling, general and administrative expenses	73.8	71.6
Income from operations	170.0	152.6
Interest expense, net	28.2	26.8
Income tax expense	36.7	34.3
Equity method investment earnings	10.6	19.9
Net income	115.7	111.4
Less: Income attributable to noncontrolling interests		3.6
Net income attributable to Lamb Weston Holdings, Inc.	115.7	107.8
Global
Segment information
Net sales	517.6	466.8
Product contribution margin	102.7	94.5
Foodservice
Segment information
Net sales	305.4	297.8
Product contribution margin	102.5	102.0
Retail
Segment information
Net sales	129.3	116.2
Product contribution margin	28.9	22.7
Other
Segment information
Net sales	36.7	34.1
Product contribution margin	$ 9.7	$ 5.0