Note 15 - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Feb. 25, 2024	May 28, 2023
Derivative assets	$ 4.1	$ 10.0
Deferred compensation assets	6.1	7.1
Available-for-sale debt securities	3.5	4.0
Total assets	13.7	21.1
Derivative liabilities	1.1	3.6
Deferred compensation liabilities	68.2	67.0
Total liabilities	69.3	70.6
Fair Value, Inputs, Level 1 [Member]
Derivative assets	4.1	9.4
Deferred compensation assets	6.1	7.1
Available-for-sale debt securities	0.0	0.0
Total assets	10.2	16.5
Derivative liabilities	0.0	0.0
Deferred compensation liabilities	68.2	67.0
Total liabilities	68.2	67.0
Fair Value, Inputs, Level 2 [Member]
Derivative assets	0.0	0.6
Deferred compensation assets	0.0	0.0
Available-for-sale debt securities	0.0	0.0
Total assets	0.0	0.6
Derivative liabilities	1.1	3.6
Deferred compensation liabilities	0.0	0.0
Total liabilities	1.1	3.6
Fair Value, Inputs, Level 3 [Member]
Derivative assets	0.0	0.0
Deferred compensation assets	0.0	0.0
Available-for-sale debt securities	3.5	4.0
Total assets	3.5	4.0
Derivative liabilities	0.0	0.0
Deferred compensation liabilities	0.0	0.0
Total liabilities	$ 0.0	$ 0.0