BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 24, 2019	Nov. 25, 2018	Nov. 24, 2019	Nov. 25, 2018
Net sales
Total net sales	$ 2,820.8	$ 2,383.7	$ 5,211.5	$ 4,218.1
Operating profit
Total operating profit	515.8	433.3	879.0	772.3
Equity method investment earnings	27.6	37.7	39.9	53.9
General corporate expense	87.7	243.4	187.2	324.2
Pension and postretirement non-service income	(11.3)	(9.7)	(20.8)	(19.9)
Interest expense, net	121.4	80.6	244.1	129.6
Income tax expense	84.1	22.4	72.6	79.8
Income from continuing operations	261.5	134.3	435.8	312.5
Less: Net income attributable to noncontrolling interests	1.0	0.8	1.5	0.8
Income from continuing operations attributable to Conagra Brands, Inc.	260.5	133.5	434.3	311.7
Snacks
Net sales
Total net sales	462.0	390.8	838.2	684.1
Other Shelf-stable
Net sales
Total net sales	680.5	609.7	1,281.9	1,087.1
Frozen
Net sales
Total net sales	938.4	690.9	1,690.3	1,154.4
Refrigerated
Net sales
Total net sales	229.9	215.8	437.1	387.5
International
Net sales
Total net sales	234.3	218.3	438.7	412.1
Foodservice
Net sales
Total net sales	275.7	258.2	525.3	492.9
Grocery & Snacks
Net sales
Total net sales	1,142.5	1,000.5	2,120.1	1,771.2
Operating profit
Total operating profit	263.7	219.6	415.4	398.2
Refrigerated & Frozen
Net sales
Total net sales	1,168.3	906.7	2,127.4	1,541.9
Operating profit
Total operating profit	187.4	156.8	343.0	252.3
International
Net sales
Total net sales	234.3	218.3	438.7	412.1
Operating profit
Total operating profit	26.4	22.5	51.2	59.8
Foodservice
Net sales
Total net sales	275.7	258.2	525.3	492.9
Operating profit
Total operating profit	$ 38.3	$ 34.4	$ 69.4	$ 62.0