BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 28, 2016	Aug. 30, 2015
Net sales
Total net sales	$ 2,667.5	$ 2,794.9
Operating profit
Equity method investment earnings	23.6	37.0
Interest expense, net	59.0	80.3
Income tax expense	218.7	85.0
Income from continuing operations	188.5	167.4
Less: Net income attributable to noncontrolling interests	3.8	1.7
Income from continuing operations attributable to ConAgra Foods, Inc.	184.7	165.7
Reporting segments
Net sales
Total net sales	2,667.5	2,794.9
Operating profit
Total operating profit	491.6	375.0
General corporate expense
Operating profit
General corporate expense	49.0	79.3
Grocery & Snacks | Reporting segments
Net sales
Total net sales	757.2	800.5
Operating profit
Total operating profit	180.5	139.5
Refrigerated & Frozen | Reporting segments
Net sales
Total net sales	604.6	657.6
Operating profit
Total operating profit	92.2	81.1
International | Reporting segments
Net sales
Total net sales	194.7	206.4
Operating profit
Total operating profit	(149.2)	16.5
Foodservice | Reporting segments
Net sales
Total net sales	268.0	270.6
Operating profit
Total operating profit	21.7	26.1
Commercial | Reporting segments
Net sales
Total net sales	843.0	859.8
Operating profit
Total operating profit	$ 346.4	$ 111.8