BUSINESS SEGMENTS AND RELATED INFORMATION - Segment Reporting Information by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	May 26, 2024	May 28, 2023	May 29, 2022
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	$ 12,050.9	$ 12,277.0	$ 11,535.9
Operating profit	1,175.0	1,464.2	1,587.6
Equity method investment earnings	177.6	212.0	145.3
General corporate expenses	322.2	388.9	241.6
Pension and postretirement non-service income	10.3	24.2	67.3
Interest expense, net	430.5	409.6	379.9
Income tax expense	262.5	218.7	290.5
Net income	347.7	683.2	888.2
Less: Net income attributable to noncontrolling interests	0.5	(0.4)
Net income attributable to Conagra Brands, Inc.	347.2	683.6	888.2
Grocery And Snacks [Member]
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	4,958.7	4,981.9	4,697.4
Operating profit	1,012.4	1,002.8	859.5
Refrigerated And Frozen [Member]
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	4,865.5	5,156.2	4,859.3
Operating profit	(92.5)	255.0	561.1
International [Member]
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	1,078.3	1,002.5	970.8
Operating profit	97.9	121.4	106.7
Foodservice [Member]
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	1,148.4	1,136.4	1,008.4
Operating profit	157.2	85.0	60.3
Frozen [Member]
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	4,061.2	4,288.1	4,091.1
Other Shelf-stable [Member]
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	2,834.1	2,851.9	2,729.5
Refrigerated [Member]
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	804.3	868.1	768.2
Snacks [Member]
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	2,124.6	2,130.0	1,967.9
International [Member]
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	1,078.3	1,002.5	970.8
Foodservice [Member]
BUSINESS SEGMENTS AND RELATED INFORMATION
Net sales	$ 1,148.4	$ 1,136.4	$ 1,008.4