BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Nov. 29, 2020	Aug. 30, 2020	Nov. 24, 2019	Aug. 25, 2019	Nov. 29, 2020	Nov. 24, 2019
Net sales
Total net sales	$ 2,995.2		$ 2,820.8		$ 5,674.1	$ 5,211.5
Operating profit
Total operating profit	642.5		515.8		1,229.6	879.0
Equity method investment earnings	23.0		27.6		29.5	39.9
General corporate expense	111.3		87.7		188.5	187.2
Pension and postretirement non-service income	(13.7)		(11.3)		(27.5)	(20.8)
Interest expense, net	107.7		121.4		221.4	244.1
Income tax expense	80.7		84.1		167.4	72.6
Net income	379.5		261.5		709.3	435.8
Less: Net income attributable to noncontrolling interests	0.6		1.0		1.4	1.5
Net income attributable to Conagra Brands, Inc.	378.9	$ 329.0	260.5	$ 173.8	707.9	434.3
Frozen
Net sales
Total net sales	1,020.3		958.9		1,938.7	1,728.2
Other Shelf-stable
Net sales
Total net sales	793.3		680.5		1,509.2	1,281.9
Snacks
Net sales
Total net sales	492.0		462.0		910.3	838.2
Foodservice
Net sales
Total net sales	212.1		275.7		407.2	525.3
International
Net sales
Total net sales	249.8		234.3		468.8	438.7
Refrigerated
Net sales
Total net sales	227.7		209.4		439.9	399.2
Grocery & Snacks
Net sales
Total net sales	1,285.3		1,142.5		2,419.5	2,120.1
Operating profit
Total operating profit	316.4		263.7		600.0	415.4
Refrigerated & Frozen
Net sales
Total net sales	1,248.0		1,168.3		2,378.6	2,127.4
Operating profit
Total operating profit	264.3		187.4		504.4	343.0
International
Net sales
Total net sales	249.8		234.3		468.8	438.7
Operating profit
Total operating profit	39.5		26.4		78.0	51.2
Foodservice
Net sales
Total net sales	212.1		275.7		407.2	525.3
Operating profit
Total operating profit	$ 22.3		$ 38.3		$ 47.2	$ 69.4