BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 24, 2019	Feb. 25, 2018	Feb. 24, 2019	Feb. 25, 2018
Net sales
Total net sales	$ 2,707.1	$ 1,994.5	$ 6,925.2	$ 5,972.1
Operating profit
Total operating profit	480.8	355.2	1,253.1	1,071.3
Equity method investment earnings	12.7	29.0	66.6	79.6
General corporate expense	62.6	108.5	386.8	231.7
Pension and postretirement non-service income	(9.8)	(21.9)	(29.7)	(60.0)
Interest expense, net	130.9	39.8	260.5	114.2
Income tax expense (benefit)	67.2	(91.4)	147.0	138.1
Income from continuing operations	242.6	349.2	555.1	726.9
Less: Net income attributable to noncontrolling interests	0.6	0.9	1.4	2.7
Income from continuing operations attributable to Conagra Brands, Inc.	242.0	348.3	553.7	724.2
Grocery & Snacks
Net sales
Total net sales	862.6	838.3	2,533.4	2,484.5
Operating profit
Total operating profit	193.5	175.6	581.2	551.6
Refrigerated & Frozen
Net sales
Total net sales	711.2	688.5	2,117.3	2,062.3
Operating profit
Total operating profit	131.4	126.1	365.0	356.5
International
Net sales
Total net sales	198.0	223.4	600.1	634.6
Operating profit
Total operating profit	25.1	29.5	87.2	68.6
Foodservice
Net sales
Total net sales	223.0	244.3	703.3	790.7
Operating profit
Total operating profit	29.2	24.0	89.4	94.6
Pinnacle Foods
Net sales
Total net sales	712.3	0.0	971.1	0.0
Operating profit
Total operating profit	101.6	0.0	130.3	0.0
Snacks
Net sales
Total net sales	354.8	303.7	1,011.6	889.2
Other Shelf-stable
Net sales
Total net sales	780.7	534.6	1,890.5	1,595.3
Frozen
Net sales
Total net sales	901.8	514.5	2,070.8	1,499.5
Refrigerated
Net sales
Total net sales	199.9	174.0	580.5	562.8
International
Net sales
Total net sales	219.4	223.4	630.1	634.6
Foodservice
Net sales
Total net sales	$ 250.5	$ 244.3	$ 741.7	$ 790.7