Note 6 - Investments in Joint Ventures - Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
	May 29, 2022	May 30, 2021	May 31, 2020
Profit (Loss)	$ 888.2	$ 1,300.9	$ 841.8
Current assets	3,033.7	2,702.1
Current liabilities	3,518.8	3,306.2
Ardent Mills [Member]
Revenues	4,258.5	3,407.6	3,393.9
Gross profit	516.5	360.6	313.1
Profit (Loss)	306.2	169.6	144.5
Current assets	1,470.1	1,101.5
Noncurrent assets	1,875.9	1,848.2
Current liabilities	720.5	524.1
Noncurrent liabilities	567.7	563.0
Other Joint Ventures [Member]
Revenues	253.2	238.8	225.0
Gross profit	54.8	47.3	49.4
Profit (Loss)	21.1	19.5	19.3
Current assets	103.4	95.0
Noncurrent assets	38.2	36.8
Current liabilities	35.1	39.9
Noncurrent liabilities	10.7	10.6
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Revenues	4,511.7	3,646.4	3,618.9
Gross profit	571.3	407.9	362.5
Profit (Loss)	$ 327.3	$ 189.1	$ 163.8