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. 28, 2021	Aug. 29, 2021	Nov. 29, 2020	Aug. 30, 2020	Nov. 28, 2021	Nov. 29, 2020
Earnings Per Share [Abstract]
Net income attributable to Conagra Brands, Inc. common stockholders:	$ 275.5	$ 235.4	$ 378.9	$ 329.0	$ 510.9	$ 707.9
Weighted average shares outstanding:
Basic weighted average shares outstanding	480.2		489.1		480.3	488.6
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities	1.7		1.8		1.8	1.7
Diluted weighted average shares outstanding	481.9		490.9		482.1	490.3