INVESTMENTS IN JOINT VENTURES (Narrative) (Details) $ in Millions		3 Months Ended								6 Months Ended	12 Months Ended
	May 29, 2014 USD ($)	May 29, 2016 USD ($)	Feb. 28, 2016 USD ($)	Nov. 29, 2015 USD ($)	Aug. 30, 2015 USD ($)	May 31, 2015 USD ($)	Feb. 22, 2015 USD ($)	Aug. 24, 2014 USD ($)	May 25, 2014 USD ($) facility	Nov. 23, 2014 USD ($)	May 29, 2016 USD ($)	May 31, 2015 USD ($)	May 25, 2014 USD ($)
Schedule of Equity Method Investments [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)
Gain on the settlement of a pension plan of an international potato venture											17.7
Sales to equity method investments											16.6	9.5
Purchases from equity method investments											90.8	98.0
Dividends received from equity method investments											78.3	91.3
Selling, general and administrative expenses											2,209.4	1,545.3	$ 1,778.9
Other Assets
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments		910.8				853.0					910.8	853.0
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 (loss) from discontinued operations, net of tax											379.6
Ardent Mills | Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Selling, general and administrative expenses											9.7	14.1
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
Ardent Mills | Other Assets
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments		$ 732.8				$ 708.4					$ 732.8	$ 708.4