SEGMENTS - Other Information - Net Sales by Product (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May 28, 2017	Feb. 26, 2017	Nov. 27, 2016	Aug. 28, 2016	May 29, 2016	Feb. 28, 2016	Nov. 29, 2015	Aug. 30, 2015	May 28, 2017	May 29, 2016	May 31, 2015
Revenue from External Customer [Line Items]
Net sales	$ 832.5	$ 768.5	$ 790.7	$ 776.3	$ 777.0	$ 728.7	$ 740.3	$ 747.8	$ 3,168.0	$ 2,993.8	$ 2,925.0
Other
Revenue from External Customer [Line Items]
Net sales									128.3	126.3	127.5
Vegetable product | Other
Revenue from External Customer [Line Items]
Net sales									81.6	70.4	74.7
Byproduct | Other
Revenue from External Customer [Line Items]
Net sales									35.4	46.4	38.6
Dairy product | Other
Revenue from External Customer [Line Items]
Net sales									$ 11.3	$ 9.5	$ 14.2