DISCONTINUED OPERATIONS AND THE FORMATION OF ARDENT MILLS (Discontinued Operations Comparative Financial Results) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2016	Feb. 22, 2015	Feb. 28, 2016	Feb. 22, 2015
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 634.0	$ 969.5	$ 2,484.7	$ 2,932.5
Net gain on sale of businesses	0.0	0.0	0.0	627.3
Goodwill and long-lived asset impairment charges	(22.5)	(1,284.1)	(1,921.1)	(1,524.8)
Income from operations of discontinued operations before income taxes and equity method investment earnings	62.1	21.9	167.6	55.7
Income (loss) before income taxes	39.6	(1,262.2)	(1,753.5)	(841.8)
Income tax expense (benefit)	20.9	(97.2)	(445.6)	136.3
Income (loss) from discontinued operations, net of tax	$ 18.7	$ (1,165.0)	$ (1,307.9)	$ (978.1)