BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 29, 2021	Aug. 30, 2020
Net sales
Total net sales	$ 2,653.3	$ 2,678.9
Operating profit
Total operating profit	427.9	587.1
Equity method investment earnings	20.2	6.5
General corporate expense	64.6	77.2
Pension and postretirement non-service income	(16.1)	(13.8)
Interest expense, net	94.2	113.7
Income tax expense	69.7	86.7
Net income	235.7	329.8
Less: Net income attributable to noncontrolling interests	0.3	0.8
Net income attributable to Conagra Brands, Inc.	235.4	329.0
Frozen
Net sales
Total net sales	920.4	918.4
Other Shelf-stable
Net sales
Total net sales	641.6	713.9
Snacks
Net sales
Total net sales	433.5	417.1
Foodservice
Net sales
Total net sales	239.8	198.3
International
Net sales
Total net sales	236.6	219.0
Refrigerated
Net sales
Total net sales	181.4	212.2
Grocery & Snacks
Net sales
Total net sales	1,075.1	1,131.0
Operating profit
Total operating profit	215.9	283.1
Refrigerated & Frozen
Net sales
Total net sales	1,101.8	1,130.6
Operating profit
Total operating profit	157.6	240.1
International
Net sales
Total net sales	236.6	219.0
Operating profit
Total operating profit	34.1	38.5
Foodservice
Net sales
Total net sales	239.8	198.3
Operating profit
Total operating profit	$ 20.3	$ 25.4