BUSINESS SEGMENTS AND RELATED INFORMATION (Segment Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 30, 2015	Aug. 24, 2014
Net sales
Total net sales	$ 2,793.8	$ 2,763.0
Operating profit
Total operating profit	380.3	312.0
Equity method investment earnings
Total equity method investment earnings	37.0	25.6
Operating profit plus equity method investment earnings
Total operating profit plus equity method investment earnings	417.3	337.6
General corporate expense	84.9	115.0
Interest expense, net	80.3	83.3
Income tax expense	84.9	43.1
Income from continuing operations	167.2	96.2
Less: Net income attributable to noncontrolling interests	1.7	2.2
Income from continuing operations attributable to ConAgra Foods, Inc.	165.5	94.0
Consumer Foods
Net sales
Total net sales	1,697.2	1,703.0
Operating profit
Total operating profit	241.5	193.1
Equity method investment earnings
Total equity method investment earnings	0.7	0.3
Operating profit plus equity method investment earnings
Total operating profit plus equity method investment earnings	242.2	193.4
Commercial Foods
Net sales
Total net sales	1,096.6	1,060.0
Operating profit
Total operating profit	138.8	118.9
Equity method investment earnings
Total equity method investment earnings	36.3	25.3
Operating profit plus equity method investment earnings
Total operating profit plus equity method investment earnings	$ 175.1	$ 144.2