INVESTMENTS IN JOINT VENTURES (Narrative) (Details) $ in Millions		3 Months Ended								12 Months Ended
	May. 29, 2014 USD ($)	May. 31, 2015 USD ($)	Feb. 22, 2015 USD ($)	Nov. 23, 2014 USD ($)	Aug. 24, 2014 USD ($)	May. 25, 2014 USD ($) facility	Feb. 23, 2014 USD ($)	Nov. 24, 2013 USD ($)	Aug. 25, 2013 USD ($)	May. 31, 2015 USD ($)	May. 25, 2014 USD ($)	May. 26, 2013 USD ($)
Schedule of Equity Method Investments [Line Items]
Cash payment										$ 0.0	$ 0.0	$ 1.5
Gain in income from discontinued operations										617.4	223.8	126.0
Income from discontinued operations		$ 4.6	$ (0.6)	$ (10.7)	$ 373.3	$ 74.8	$ 10.8	$ 42.0	$ 13.8	366.6	141.4	87.7
Sales to equity method investments										9.5
Purchases from equity method investments										142.2
Dividends received from equity method investments										91.3
Selling, general and administrative expenses										3,472.1	2,771.2	$ 2,065.9
Ardent Mills
Schedule of Equity Method Investments [Line Items]
Cash payment	$ 49.0
Ownership percentage	44.00%
Proceeds from divestiture of business	$ 391.4
Gain in income from discontinued operations										625.6
Income from discontinued operations										379.6
Ardent Mills | Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Selling, general and administrative expenses										14.1
Ardent Mills | Other Assets
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments		$ 853.0				131.2				$ 853.0	$ 131.2
Three flour milling facilities
Schedule of Equity Method Investments [Line Items]
Proceeds from divestiture of business						$ 163.0
Number of flour mining facilities sold | facility						3