Segment Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 26, 2012	Aug. 28, 2011
Net sales
Net sales	$ 3,311.9	$ 3,105.3
Operating profit
Operating profit	374.9	293.7
Equity method investment earnings
Equity method investment earnings	7.6	6.2
Operating profit plus equity method investment earnings
Total operating profit plus equity method investment earnings	382.5	299.9
General corporate expenses	(42.5)	104.3
Interest expense, net	49.3	52.9
Income tax expense	123.5	48.7
Income from continuing operations	252.2	94.0
Less: Net income attributable to noncontrolling interests	2.1	0.3
Income from continuing operations attributable to ConAgra Foods, Inc.	250.1	93.7
Consumer Foods
Net sales
Net sales	2,042.6	1,891.7
Operating profit
Operating profit	235.3	196.2
Equity method investment earnings
Equity method investment earnings	0.1	1.0
Operating profit plus equity method investment earnings
Total operating profit plus equity method investment earnings	235.4	197.2
Commercial Foods
Net sales
Net sales	1,269.3	1,213.6
Operating profit
Operating profit	139.6	97.5
Equity method investment earnings
Equity method investment earnings	7.5	5.2
Operating profit plus equity method investment earnings
Total operating profit plus equity method investment earnings	$ 147.1	$ 102.7