BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 30, 2020	Aug. 25, 2019
Net sales
Total net sales	$ 2,678.9	$ 2,390.7
Operating profit
Total operating profit	587.1	363.2
Equity method investment earnings	6.5	12.3
General corporate expense	77.2	99.5
Pension and postretirement non-service income	(13.8)	(9.5)
Interest expense, net	113.7	122.7
Income tax expense (benefit)	86.7	(11.5)
Net income	329.8	174.3
Less: Net income attributable to noncontrolling interests	0.8	0.5
Net income attributable to Conagra Brands, Inc.	329.0	173.8
Snacks
Net sales
Total net sales	418.3	376.2
Other Shelf-stable
Net sales
Total net sales	715.9	601.4
Frozen
Net sales
Total net sales	935.6	792.7
Refrigerated
Net sales
Total net sales	195.0	166.4
International
Net sales
Total net sales	219.0	204.4
Foodservice
Net sales
Total net sales	195.1	249.6
Grocery & Snacks
Net sales
Total net sales	1,134.2	977.6
Operating profit
Total operating profit	283.6	151.7
Refrigerated & Frozen
Net sales
Total net sales	1,130.6	959.1
Operating profit
Total operating profit	240.1	155.6
International
Net sales
Total net sales	219.0	204.4
Operating profit
Total operating profit	38.5	24.8
Foodservice
Net sales
Total net sales	195.1	249.6
Operating profit
Total operating profit	$ 24.9	$ 31.1