Note 8 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	May 29, 2022	May 30, 2021	May 31, 2020
Net income attributable to Conagra Brands, Inc. common stockholders:	$ 888.2	$ 1,298.8	$ 840.1
Basic weighted average shares outstanding (in shares)	480.3	485.8	487.3
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities (in shares)	1.9	2.0	1.3
Diluted weighted average shares outstanding (in shares)	482.2	487.8	488.6