Note 7 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended						9 Months Ended
	Feb. 27, 2022	Feb. 26, 2023	Nov. 27, 2022	Aug. 28, 2022	Feb. 27, 2022	Nov. 28, 2021	Aug. 29, 2021	Feb. 26, 2023	Feb. 27, 2022
Net income attributable to Conagra Brands, Inc. common stockholders:	$ 218.4	$ 341.7	$ 381.9	$ (77.5)	$ 218.4	$ 275.5	$ 235.4	$ 646.1	$ 729.3
Basic weighted average shares outstanding (in shares)		477.5			480.3			479.3	480.3
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities (in shares)		1.9			1.9			1.7	1.9
Diluted weighted average shares outstanding (in shares)		479.4			482.2			481.0	482.2