BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	12 Months Ended
	May 30, 2021	May 31, 2020	May 26, 2019
Net sales
Total net sales	$ 11,184.7	$ 11,054.4	$ 9,538.4
Operating profit
Total operating profit	2,141.0	1,815.6	1,641.8
Equity method investment earnings	84.4	73.2	75.8
General corporate expenses	364.8	368.5	462.2
Pension and postretirement non-service income	54.5	9.9	35.1
Interest expense, net	420.4	487.1	391.4
Income tax expense	193.8	201.3	218.8
Income from continuing operations	1,300.9	841.8	680.3
Less: Net income attributable to noncontrolling interests	2.1	1.7	0.1
Income from continuing operations attributable to Conagra Brands, Inc.	1,298.8	840.1	680.2
Frozen
Net sales
Total net sales	3,948.0	3,735.5	2,994.8
Other Shelf-stable
Net sales
Total net sales	2,838.0	2,902.8	2,426.7
Refrigerated
Net sales
Total net sales	826.6	824.1	740.6
Snacks
Net sales
Total net sales	1,799.5	1,714.3	1,496.9
International
Net sales
Total net sales	938.6	925.3	864.4
Foodservice
Net sales
Total net sales	834.0	952.4	1,015.0
Grocery & Snacks
Net sales
Total net sales	4,637.5	4,617.1	3,923.6
Operating profit
Total operating profit	1,093.8	915.2	762.6
Refrigerated & Frozen
Net sales
Total net sales	4,774.6	4,559.6	3,735.4
Operating profit
Total operating profit	836.5	702.2	645.1
International
Net sales
Total net sales	938.6	925.3	864.4
Operating profit
Total operating profit	131.8	100.6	99.8
Foodservice
Net sales
Total net sales	834.0	952.4	1,015.0
Operating profit
Total operating profit	$ 78.9	$ 97.6	$ 134.3