Note 8 - Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Aug. 27, 2023	Aug. 28, 2022
Net income (loss) attributable to Conagra Brands, Inc. common stockholders:	$ 319.7	$ (77.5)
Basic weighted average shares outstanding (in shares)	478.2	480.6
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities (in shares)	1.6	0.0
Diluted weighted average shares outstanding (in shares)	479.8	480.6