EARNINGS PER SHARE - Schedule of basic and diluted earnings per share (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	May 25, 2025	May 26, 2024	May 28, 2023
Earnings Per Share [Abstract]
Net income attributable to Conagra Brands, Inc.	$ 1,152.4	$ 347.2	$ 683.6
Basic weighted average shares outstanding (in shares)	478.3	478.6	478.9
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities	1.4	1.4	1.8
Diluted weighted average shares outstanding (in shares)	479.7	480.0	480.7