BUSINESS SEGMENTS AND RELATED INFORMATION (Segment Operations) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 25, 2013	Aug. 26, 2012
Net sales
Net sales	$ 4,201.8	$ 3,302.3
Operating profit
Operating profit	398.0	375.6
Equity method investment earnings
Equity method investment earnings	4.1	7.6
Operating profit plus equity method investment earnings
Total operating profit plus equity method investment earnings	402.1	383.2
General corporate expenses	126.5	(42.5)
Interest expense, net	95.6	49.3
Income tax expense	33.9	123.8
Income from continuing operations	146.1	252.6
Less: Net income attributable to noncontrolling interests	2.9	2.1
Income from continuing operations attributable to ConAgra Foods, Inc.	143.2	250.5
Consumer Foods
Net sales
Net sales	1,995.9	2,033.0
Operating profit
Operating profit	186.5	236.0
Equity method investment earnings
Equity method investment earnings	0.4	0.1
Operating profit plus equity method investment earnings
Total operating profit plus equity method investment earnings	186.9	236.1
Commercial Foods
Net sales
Net sales	1,263.9	1,269.3
Operating profit
Operating profit	129.8	139.6
Equity method investment earnings
Equity method investment earnings	3.7	7.5
Operating profit plus equity method investment earnings
Total operating profit plus equity method investment earnings	133.5	147.1
Ralcorp Food Group
Net sales
Net sales	703.4	0
Operating profit
Operating profit	61.0	0
Operating profit plus equity method investment earnings
Total operating profit plus equity method investment earnings	61.0	0
Ralcorp Frozen Bakery Products
Net sales
Net sales	238.6	0
Operating profit
Operating profit	20.7	0
Operating profit plus equity method investment earnings
Total operating profit plus equity method investment earnings	$ 20.7	$ 0