Note 6 - Investments in Joint Ventures - Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2023	May 29, 2022	May 30, 2021
Profit (Loss)	$ 683.2	$ 888.2	$ 1,300.9
Current assets	3,385.0	3,033.7
Current liabilities	4,440.7	3,518.8
Ardent Mills [Member]
Revenues	5,239.9	4,258.5	3,407.6
Gross profit	745.4	516.5	360.6
Profit (Loss)	453.2	306.2	169.6
Current assets	1,716.8	1,470.1
Noncurrent assets	1,840.5	1,875.9
Current liabilities	750.3	720.5
Noncurrent liabilities	556.9	567.7
Other Joint Ventures [Member]
Revenues	283.3	253.2	238.8
Gross profit	59.4	54.8	47.3
Profit (Loss)	22.3	21.1	19.5
Current assets	131.4	103.4
Noncurrent assets	42.6	38.2
Current liabilities	46.7	35.1
Noncurrent liabilities	9.0	10.7
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Revenues	5,523.2	4,511.7	3,646.4
Gross profit	804.8	571.3	407.9
Profit (Loss)	$ 475.5	$ 327.3	$ 189.1