BUSINESS SEGMENTS AND RELATED INFORMATION - Segment Reporting Information by Segment (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Feb. 23, 2025	Nov. 24, 2024	Aug. 25, 2024	Feb. 25, 2024	Nov. 26, 2023	Aug. 27, 2023	Feb. 23, 2025	Feb. 25, 2024
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	$ 2,841.0			$ 3,032.9			$ 8,831.0	$ 9,145.0
Operating profit	395.0			578.4			1,361.3	1,647.4
Equity method investment earnings	47.4			41.2			125.0	131.0
General corporate expenses	155.6			107.0			317.7	238.5
Pension and postretirement non-service expense (income)	3.1			(1.4)			9.3	(2.1)
Interest expense, net	100.9			106.5			314.9	325.8
Income tax expense (benefit)	43.9			95.9			(33.5)	297.1
Net income	145.1			308.8			896.5	914.9
Less: Net income attributable to noncontrolling interests				0.2			0.1	0.4
Net income attributable to Conagra Brands, Inc. common stockholders:	145.1	$ 284.5	$ 466.8	308.6	$ 286.2	$ 319.7	896.4	914.5
Grocery & Snacks
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	1,245.4			1,286.0			3,749.1	3,784.0
Operating profit	237.6			299.3			779.9	837.2
Refrigerated & Frozen
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	1,115.6			1,202.4			3,540.5	3,692.5
Operating profit	95.7			201.5			374.3	620.9
International
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	223.9			271.7			726.4	811.5
Operating profit	33.1			42.2			107.6	71.8
Food service
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	256.1			272.8			815.0	857.0
Operating profit	28.6			35.4			99.5	117.5
Frozen
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	944.4			1,021.8			2,998.0	3,076.3
Other Shelf-stable
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	717.5			750.1			2,158.8	2,174.9
Refrigerated
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	171.2			180.6			542.5	616.2
Snacks
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	527.9			535.9			1,590.3	1,609.1
International
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	223.9			271.7			726.4	811.5
Food service
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	$ 256.1			$ 272.8			$ 815.0	$ 857.0