EARNINGS PER SHARE - Reconciliation of Income and Average Share Amounts Used to Compute Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Nov. 24, 2019	Aug. 25, 2019	Nov. 25, 2018	Aug. 26, 2018	Nov. 24, 2019	Nov. 25, 2018
Net income attributable to Conagra Brands, Inc. common stockholders:
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders	$ 260.5		$ 133.5		$ 434.3	$ 311.7
Loss from discontinued operations, net of tax, attributable to Conagra Brands, Inc. common stockholders			(1.9)			(1.9)
Net income attributable to Conagra Brands, Inc.	$ 260.5	$ 173.8	$ 131.6	$ 178.2	$ 434.3	$ 309.8
Weighted average shares outstanding:
Basic weighted average shares outstanding (in shares)	487.3		419.9		487.0	407.7
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities (in shares)	1.0		1.9		1.1	2.2
Diluted weighted average shares outstanding (in shares)	488.3		421.8		488.1	409.9