INVESTMENTS IN JOINT VENTURES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Schedule of Equity Method Investments [Line Items]
Dividends received from equity method investments	$ 62.5	$ 68.2	$ 40.4
Other assets
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	776.2	741.3
Equity method investments
Schedule of Equity Method Investments [Line Items]
Purchases from equity method investees	$ 34.9		61.2
Sales to equity method investees		41.8	1.6
Others
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	50.00%
Ardent Mills
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	44.00%
Ardent Mills | Equity method investments
Schedule of Equity Method Investments [Line Items]
Sales to equity method investees		$ 0.1	$ 9.7