EARNINGS PER SHARE - Reconciliation of Income and Average Share Amounts Used to Compute Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Millions, $ 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
Earnings Per Share [Abstract]
Net income attributable to Conagra Brands, Inc. common stockholders:	$ 378.9	$ 329.0	$ 260.5	$ 173.8	$ 707.9	$ 434.3
Weighted average shares outstanding:
Basic weighted average shares outstanding	489.1		487.3		488.6	487.0
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities	1.8		1.0		1.7	1.1
Diluted weighted average shares outstanding	490.9		488.3		490.3	488.1