INVESTMENTS IN JOINT VENTURES (Details) - USD ($) $ in Millions	12 Months Ended
	May 29, 2016	May 31, 2015
Equity Method Investment, Summarized Financial Information, Statement of Earnings [Abstract]
Total net sales	$ 4,479.8	$ 4,338.6
Total gross margin	539.0	570.3
Total earnings after income taxes	250.6	279.4
Ardent Mills
Equity Method Investment, Summarized Financial Information, Statement of Earnings [Abstract]
Total net sales	3,395.3	3,299.2
Total gross margin	339.2	365.3
Total earnings after income taxes	142.9	173.5
Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract]
Current assets	988.4	1,080.3
Noncurrent assets	1,695.3	1,692.5
Current liabilities	507.7	415.3
Noncurrent liabilities	545.0	649.5
Potato joint ventures
Equity Method Investment, Summarized Financial Information, Statement of Earnings [Abstract]
Total net sales	917.3	872.1
Total gross margin	167.0	171.7
Total earnings after income taxes	101.3	99.8
Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract]
Current assets	304.8	285.3
Noncurrent assets	294.8	193.0
Current liabilities	202.2	151.8
Noncurrent liabilities	81.7	47.1
Others
Equity Method Investment, Summarized Financial Information, Statement of Earnings [Abstract]
Total net sales	167.2	167.3
Total gross margin	32.8	33.3
Total earnings after income taxes	6.4	6.1
Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract]
Current assets	80.8	73.1
Noncurrent assets	10.5	10.8
Current liabilities	51.0	42.2
Noncurrent liabilities	$ 0.0	$ 0.0