BUSINESS SEGMENTS AND RELATED INFORMATION BUSINESS SEGMENTS AND RELATED INFORMATION (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	May 25, 2014	Feb. 23, 2014	Nov. 24, 2013	Aug. 25, 2013	May 26, 2013	Feb. 24, 2013	Nov. 25, 2012	Aug. 26, 2012	May 25, 2014	May 26, 2013	May 27, 2012
Segment Reporting Information [Line Items]
Net sales	$ 4,436.8	$ 4,389.7	$ 4,695.3	$ 4,180.8	$ 4,563.3	$ 3,833.8	$ 3,727.2	$ 3,302.3	$ 17,702.6	$ 15,426.6	$ 13,331.1
Operating profit									1,299.0	1,854.6	1,589.1
Equity method investment earnings									32.8	37.5	44.9
Operating profit plus equity method investment earnings									1,331.8	1,892.1	1,634.0
Interest expense, net									379.0	275.6	204.0
Income tax expense									298.2	400.7	191.7
Income from continuing operations									311.0	786.8	467.9
Less: Net income attributable to noncontrolling interests									12.0	12.2	6.5
Income from continuing operations attributable to ConAgra Foods, Inc.									299.0	774.6	461.4
Identifiable assets	19,366.4				20,405.3				19,366.4	20,405.3	11,441.9
Assets Held-for-sale, at Carrying Value	10.9				208.9				10.9	208.9	96.0
Additions to property, plant and equipment									602.4	453.7	335.7
Depreciation and amortization									602.9	443.4	370.9
Consumer Foods
Segment Reporting Information [Line Items]
Net sales									7,315.5	7,551.4	6,945.8
Operating profit									899.4	1,000.2	878.2
Equity method investment earnings									2.8	1.8	4.9
Operating profit plus equity method investment earnings									902.2	1,002.0	883.1
Identifiable assets	7,666.1				7,845.5				7,666.1	7,845.5	7,205.4
Additions to property, plant and equipment									183.5	187.9	150.3
Depreciation and amortization									201.0	183.1	172.1
Commercial Foods
Segment Reporting Information [Line Items]
Net sales									6,191.2	6,067.0	5,747.0
Operating profit									774.6	731.3	615.7
Equity method investment earnings									30.0	35.7	40.0
Operating profit plus equity method investment earnings									804.6	767.0	655.7
Identifiable assets	3,904.8				3,619.8				3,904.8	3,619.8	2,801.0
Additions to property, plant and equipment									230.8	148.8	99.2
Depreciation and amortization									115.0	106.9	96.7
Private Brands
Segment Reporting Information [Line Items]
Net sales									4,195.9	1,808.2	638.3
Operating profit									(375.0)	123.1	95.2
Operating profit plus equity method investment earnings									(375.0)	123.1	95.2
Identifiable assets	6,912.4				7,676.5				6,912.4	7,676.5	544.7
Additions to property, plant and equipment									125.2	57.0	16.2
Depreciation and amortization									205.2	79.9	18.5
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
General corporate expenses									343.6	429.0	770.4
Identifiable assets	872.2				1,054.6				872.2	1,054.6	794.8
Additions to property, plant and equipment									62.9	60.0	70.0
Depreciation and amortization									$ 81.7	$ 73.5	$ 83.6