BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 25, 2018	Feb. 26, 2017	Feb. 25, 2018	Feb. 26, 2017
Net sales
Total net sales	$ 1,994.5	$ 1,981.2	$ 5,972.1	$ 5,965.2
Operating profit
Total operating profit	355.2	376.5	1,071.3	1,067.9
Equity method investment earnings	29.0	21.8	79.6	52.1
General corporate expense	86.6	105.2	171.7	254.1
Interest expense, net	39.8	45.7	114.2	158.0
Income tax expense (benefit)	(91.4)	67.9	138.1	315.5
Income from continuing operations	349.2	179.5	726.9	392.4
Less: Net income attributable to noncontrolling interests of continuing operations	0.9	0.5	2.7	1.3
Income from continuing operations attributable to Conagra Brands, Inc.	348.3	179.0	724.2	391.1
Grocery & Snacks
Net sales
Total net sales	838.3	849.0	2,484.5	2,459.4
Operating profit
Total operating profit	175.6	202.1	551.6	602.8
Refrigerated & Frozen
Net sales
Total net sales	688.5	667.2	2,062.3	2,012.5
Operating profit
Total operating profit	126.1	128.7	356.5	338.9
International
Net sales
Total net sales	223.4	205.2	634.6	611.3
Operating profit
Total operating profit	29.5	18.1	68.6	(157.8)
Foodservice
Net sales
Total net sales	244.3	259.8	790.7	810.9
Operating profit
Total operating profit	24.0	27.8	94.6	81.4
Commercial
Net sales
Total net sales	0.0	0.0	0.0	71.1
Operating profit
Total operating profit	$ 0.0	$ (0.2)	$ 0.0	$ 202.6