BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 28, 2016
Net sales
Total net sales	$ 1,981.2	$ 2,199.3	$ 5,965.2	$ 6,611.1
Operating profit
Total operating profit	376.5	324.7	1,067.9	963.1
Equity method investment earnings	21.8	8.6	52.1	50.7
General corporate expense	105.2	151.9	254.1	407.0
Interest expense, net	45.7	76.4	158.0	235.7
Income tax expense	67.9	33.6	315.5	126.0
Income from continuing operations	179.5	71.4	392.4	245.1
Less: Net income attributable to noncontrolling interests of continuing operations	0.5	0.4	1.3	1.3
Income from continuing operations attributable to Conagra Brands, Inc.	179.0	71.0	391.1	243.8
Grocery & Snacks
Net sales
Total net sales	849.8	898.0	2,460.9	2,604.6
Operating profit
Total operating profit	201.9	153.4	602.7	478.6
Refrigerated & Frozen
Net sales
Total net sales	666.4	708.9	2,011.0	2,193.3
Operating profit
Total operating profit	128.9	116.8	339.0	321.7
International
Net sales
Total net sales	205.2	211.6	611.3	639.3
Operating profit
Total operating profit	18.1	16.4	(157.8)	53.0
Foodservice
Net sales
Total net sales	259.8	266.6	810.9	822.2
Operating profit
Total operating profit	27.8	27.9	81.4	74.5
Commercial
Net sales
Total net sales	0.0	114.2	71.1	351.7
Operating profit
Total operating profit	$ (0.2)	$ 10.2	$ 202.6	$ 35.3