BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 26, 2018	Aug. 27, 2017
Net sales
Total net sales	$ 1,834.4	$ 1,804.2
Operating profit
Total operating profit	339.0	320.2
Equity method investment earnings	16.2	30.0
General corporate expense	80.8	60.8
Pension and postretirement non-service income	(10.2)	(20.6)
Interest expense, net	49.0	36.4
Income tax expense	57.4	120.0
Income from continuing operations	178.2	153.6
Less: Net income attributable to noncontrolling interests of continuing operations	0.0	0.8
Income from continuing operations attributable to Conagra Brands, Inc.	178.2	152.8
Grocery & Snacks
Net sales
Total net sales	771.1	745.8
Operating profit
Total operating profit	178.7	176.2
Refrigerated & Frozen
Net sales
Total net sales	635.2	615.7
Operating profit
Total operating profit	95.5	101.9
International
Net sales
Total net sales	193.8	190.9
Operating profit
Total operating profit	37.3	18.9
Foodservice
Net sales
Total net sales	234.3	251.8
Operating profit
Total operating profit	27.5	23.2
Snacks
Net sales
Total net sales		257.5
Snacks | Grocery & Snacks
Net sales
Total net sales	291.4
Other Shelf-stable
Net sales
Total net sales		488.3
Other Shelf-stable | Grocery & Snacks
Net sales
Total net sales	479.7
Frozen
Net sales
Total net sales		432.3
Frozen | Refrigerated & Frozen
Net sales
Total net sales	463.5
Refrigerated
Net sales
Total net sales		$ 183.4
Refrigerated | Refrigerated & Frozen
Net sales
Total net sales	$ 171.7