BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 25, 2018	Nov. 26, 2017	Nov. 25, 2018	Nov. 26, 2017
Net sales
Total net sales	$ 2,383.7	$ 2,173.4	$ 4,218.1	$ 3,977.6
Operating profit
Total operating profit	433.3	395.9	772.3	716.1
Equity method investment earnings	37.7	20.6	53.9	50.6
General corporate expense	243.4	62.4	324.2	123.2
Pension and postretirement non-service income	(9.7)	(17.5)	(19.9)	(38.1)
Interest expense, net	80.6	38.0	129.6	74.4
Income tax expense	22.4	109.5	79.8	229.5
Income from continuing operations	134.3	224.1	312.5	377.7
Less: Net income attributable to noncontrolling interests	0.8	1.0	0.8	1.8
Income from continuing operations attributable to Conagra Brands, Inc.	133.5	223.1	311.7	375.9
Grocery & Snacks
Net sales
Total net sales	899.7	900.4	1,670.8	1,646.2
Operating profit
Total operating profit	209.0	199.8	387.7	376.0
Refrigerated & Frozen
Net sales
Total net sales	770.9	758.1	1,406.1	1,373.8
Operating profit
Total operating profit	138.1	128.5	233.6	230.4
International
Net sales
Total net sales	208.3	220.3	402.1	411.2
Operating profit
Total operating profit	24.8	20.2	62.1	39.1
Foodservice
Net sales
Total net sales	246.0	294.6	480.3	546.4
Operating profit
Total operating profit	32.7	47.4	60.2	70.6
Pinnacle Foods
Net sales
Total net sales	258.8	0.0	258.8	0.0
Operating profit
Total operating profit	28.7	0.0	28.7	0.0
Snacks
Net sales
Total net sales	363.1	324.5	656.8	585.5
Other Shelf-stable
Net sales
Total net sales	632.4	575.9	1,109.8	1,060.7
Frozen
Net sales
Total net sales	705.5	552.7	1,169.0	985.0
Refrigerated
Net sales
Total net sales	208.9	205.4	380.6	388.8
International
Net sales
Total net sales	216.9	220.3	410.7	411.2
Foodservice
Net sales
Total net sales	$ 256.9	$ 294.6	$ 491.2	$ 546.4