Note 8 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	May 28, 2023	May 29, 2022	May 30, 2021
Net income attributable to Conagra Brands, Inc. common stockholders:	$ 683.6	$ 888.2	$ 1,298.8
Basic weighted average shares outstanding (in shares)	478.9	480.3	485.8
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities (in shares)	1.8	1.9	2.0
Diluted weighted average shares outstanding (in shares)	480.7	482.2	487.8