BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Nov. 28, 2021	Aug. 29, 2021	Nov. 29, 2020	Aug. 30, 2020	Nov. 28, 2021	Nov. 29, 2020
Net sales
Total net sales	$ 3,058.9		$ 2,995.2		$ 5,712.2	$ 5,674.1
Operating profit
Total operating profit	468.4		642.5		896.3	1,229.6
Equity method investment earnings	29.5		23.0		49.7	29.5
General corporate expense	59.0		111.3		123.6	188.5
Pension and postretirement non-service income	(16.1)		(13.7)		(32.2)	(27.5)
Interest expense, net	94.9		107.7		189.1	221.4
Income tax expense	84.2		80.7		153.9	167.4
Net income	275.9		379.5		511.6	709.3
Less: Net income attributable to noncontrolling interests	0.4		0.6		0.7	1.4
Net income attributable to Conagra Brands, Inc.	275.5	$ 235.4	378.9	$ 329.0	510.9	707.9
Frozen
Net sales
Total net sales	1,073.1		1,020.3		1,993.5	1,938.7
Other Shelf-stable
Net sales
Total net sales	724.6		791.9		1,366.2	1,505.8
Snacks
Net sales
Total net sales	539.9		491.2		973.4	908.3
Foodservice
Net sales
Total net sales	246.3		214.3		486.1	412.6
International
Net sales
Total net sales	262.2		249.8		498.8	468.8
Refrigerated
Net sales
Total net sales	212.8		227.7		394.2	439.9
Grocery & Snacks
Net sales
Total net sales	1,264.5		1,283.1		2,339.6	2,414.1
Operating profit
Total operating profit	249.2		316.1		465.1	599.2
Refrigerated & Frozen
Net sales
Total net sales	1,285.9		1,248.0		2,387.7	2,378.6
Operating profit
Total operating profit	168.3		264.3		325.9	504.4
International
Net sales
Total net sales	262.2		249.8		498.8	468.8
Operating profit
Total operating profit	37.1		39.5		71.2	78.0
Foodservice
Net sales
Total net sales	246.3		214.3		486.1	412.6
Operating profit
Total operating profit	$ 13.8		$ 22.6		$ 34.1	$ 48.0