Consolidated Statements of Earnings (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	May 25, 2014	May 26, 2013	May 27, 2012
Income Statement [Abstract]
Net sales	$ 17,702.6	$ 15,426.6	$ 13,331.1
Costs and expenses:
Cost of goods sold	13,980.1	11,864.4	10,532.1
Selling, general and administrative expenses	2,767.1	2,136.6	1,980.3
Interest expense, net	379.0	275.6	204.0
Income from continuing operations before income taxes and equity method investment earnings	576.4	1,150.0	614.7
Income tax expense	298.2	400.7	191.7
Equity method investment earnings	32.8	37.5	44.9
Income from continuing operations	311.0	786.8	467.9
Income (loss) from discontinued operations, net of tax	4.1	(0.7)	6.5
Net income	315.1	786.1	474.4
Less: Net income attributable to noncontrolling interests	12.0	12.2	6.5
Net income attributable to ConAgra Foods, Inc.	$ 303.1	$ 773.9	$ 467.9
Earnings per share — basic
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ 0.71	$ 1.88	$ 1.11
Income from discontinued operations attributable to ConAgra Foods, Inc. common stockholders	$ 0.01	$ 0.00	$ 0.02
Net income attributable to ConAgra Foods, Inc. common stockholders	$ 0.72	$ 1.88	$ 1.13
Earnings per share — diluted
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ 0.70	$ 1.85	$ 1.10
Income from discontinued operations attributable to ConAgra Foods, Inc. common stockholders	$ 0.00	$ 0.00	$ 0.02
Net income attributable to ConAgra Foods, Inc. common stockholders	$ 0.70	$ 1.85	$ 1.12