BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 27, 2017	Aug. 28, 2016
Net sales
Total net sales	$ 1,804.2	$ 1,895.6
Operating profit
Total operating profit	320.2	348.5
Equity method investment earnings	30.0	13.1
General corporate expense	40.2	35.6
Interest expense, net	36.4	58.2
Income tax expense	120.0	169.2
Income from continuing operations	153.6	98.6
Less: Net income attributable to noncontrolling interests of continuing operations	0.8	0.2
Income from continuing operations attributable to Conagra Brands, Inc.	152.8	98.4
Grocery & Snacks
Net sales
Total net sales	745.8	757.2
Operating profit
Total operating profit	176.2	180.5
Refrigerated & Frozen
Net sales
Total net sales	615.7	604.6
Operating profit
Total operating profit	101.9	92.2
International
Net sales
Total net sales	190.9	194.7
Operating profit
Total operating profit	18.9	(149.2)
Foodservice
Net sales
Total net sales	251.8	268.0
Operating profit
Total operating profit	23.2	21.7
Commercial
Net sales
Total net sales	0.0	71.1
Operating profit
Total operating profit	$ 0.0	$ 203.3