Condensed Consolidated Statements of Earnings (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 22, 2015	Feb. 23, 2014	Feb. 22, 2015	Feb. 23, 2014
Income Statement [Abstract]
Net sales	$ 3,876.7	$ 3,947.3	$ 11,727.7	$ 11,884.2
Costs and expenses:
Cost of goods sold	3,052.9	3,024.2	9,311.6	9,209.2
Selling, general and administrative expenses	1,726.1	534.9	2,950.7	1,626.1
Interest expense, net	80.3	95.0	243.3	286.3
Income (loss) from continuing operations before income taxes and equity method investment earnings	(982.6)	293.2	(777.9)	762.6
Income tax expense	2.5	78.2	129.0	213.1
Equity method investment earnings	33.0	11.1	92.6	20.4
Income (loss) from continuing operations	(952.1)	226.1	(814.3)	569.9
Income (loss) from discontinued operations, net of tax	(0.6)	10.8	362.0	66.6
Net income (loss)	(952.7)	236.9	(452.3)	636.5
Less: Net income attributable to noncontrolling interests	1.4	2.6	9.5	9.2
Net income (loss) attributable to ConAgra Foods, Inc.	$ (954.1)	$ 234.3	$ (461.8)	$ 627.3
Earnings per share — basic
Income (loss) from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ (2.23)	$ 0.53	$ (1.94)	$ 1.33
Income from discontinued operations attributable to ConAgra Foods, Inc. common stockholders	$ 0.00	$ 0.03	$ 0.85	$ 0.16
Net income (loss) attributable to ConAgra Foods, Inc. common stockholders	$ (2.23)	$ 0.56	$ (1.09)	$ 1.49
Earnings per share — diluted
Income (loss) from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ (2.23)	$ 0.52	$ (1.94)	$ 1.31
Income from discontinued operations attributable to ConAgra Foods, Inc. common stockholders	$ 0.00	$ 0.03	$ 0.85	$ 0.15
Net income (loss) attributable to ConAgra Foods, Inc. common stockholders	$ (2.23)	$ 0.55	$ (1.09)	$ 1.46
Cash dividends declared per common share	$ 0.25	$ 0.25	$ 0.75	$ 0.75