INVESTMENTS IN JOINT VENTURES - Summary of Combined Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 26, 2019	May 27, 2018
Statement of Earnings
Total net sales	$ 3,618.9	$ 3,671.4	$ 3,542.9
Total gross margin	362.5	327.4	421.3
Total earnings after income taxes	163.8	170.0	207.1
Ardent Mills
Statement of Earnings
Total net sales	3,393.9	3,476.0	3,344.1
Total gross margin	313.1	281.9	386.5
Total earnings after income taxes	144.5	151.9	197.0
Balance Sheet
Current assets	1,010.6	952.6
Noncurrent assets	1,720.2	1,669.8
Current liabilities	454.8	361.2
Noncurrent liabilities	503.4	496.9
Others
Statement of Earnings
Total net sales	225.0	195.4	198.8
Total gross margin	49.4	45.5	34.8
Total earnings after income taxes	19.3	18.1	$ 10.1
Balance Sheet
Current assets	87.1	89.2
Noncurrent assets	24.5	19.0
Current liabilities	44.1	43.4
Noncurrent liabilities	$ 8.3	$ 0.7