DISCONTINUED OPERATIONS (Details) - USD ($) $ in Millions	3 Months Ended							6 Months Ended	12 Months Ended
	May 29, 2016	Feb. 28, 2016	Nov. 29, 2015	Aug. 30, 2015	May 31, 2015	Feb. 22, 2015	Aug. 24, 2014	Nov. 23, 2014	May 29, 2016	May 31, 2015	May 25, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax	$ 146.0	$ 18.7	$ (6.8)	$ (1,319.8)	$ (23.0)	$ (1,165.0)	$ 389.1	$ (202.2)	$ (1,161.9)	$ (1,001.1)	$ (310.1)
Private Brands
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales									2,490.6	3,895.4	4,005.4
Long-lived asset impairment charge									(1,923.0)	(1,564.6)	(596.2)
Income (loss) from operations of discontinued operations before income taxes									168.0	68.8	186.5
Income (loss) before income taxes and equity method investment earnings									(1,755.0)	(1,495.8)	(409.7)
Income tax expense (benefit)									(593.1)	(128.1)	41.8
Income (loss) from discontinued operations, net of tax									$ (1,161.9)	(1,367.7)	(451.5)
ConAgra Mills
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales										16.2	1,859.0
Income (loss) from operations of discontinued operations before income taxes										(9.2)	124.8
Net gain on sale of businesses										627.3	90.3
Income (loss) before income taxes and equity method investment earnings										618.1	215.1
Income tax expense (benefit)										251.1	78.0
Equity method investment earnings										0.0	0.3
Income (loss) from discontinued operations, net of tax										$ 367.0	$ 137.4