Note 13 - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Feb. 26, 2023	May 29, 2022
Derivative assets	$ 7.7	$ 7.0
Deferred compensation assets	7.0	7.5
Available-for-sale debt securities	4.0	7.6
Total assets	18.7	22.1
Derivative liabilities	2.6	2.2
Deferred compensation liabilities	65.5	72.6
Total liabilities	68.1	74.8
Available-for-sale debt securities	4.0	7.6
Fair Value, Inputs, Level 1 [Member]
Derivative assets	5.8	5.7
Deferred compensation assets	7.0	7.5
Available-for-sale debt securities	0.0	0.0
Total assets	12.8	13.2
Derivative liabilities	0.0	0.0
Deferred compensation liabilities	65.5	72.6
Total liabilities	65.5	72.6
Available-for-sale debt securities	0.0	0.0
Fair Value, Inputs, Level 2 [Member]
Derivative assets	1.9	1.3
Deferred compensation assets	0.0	0.0
Available-for-sale debt securities	0.0	0.0
Total assets	1.9	1.3
Derivative liabilities	2.6	2.2
Deferred compensation liabilities	0.0	0.0
Total liabilities	2.6	2.2
Available-for-sale debt securities	0.0	0.0
Fair Value, Inputs, Level 3 [Member]
Derivative assets	0.0	0.0
Deferred compensation assets	0.0	0.0
Available-for-sale debt securities	4.0	7.6
Total assets	4.0	7.6
Derivative liabilities	0.0	0.0
Deferred compensation liabilities	0.0	0.0
Total liabilities	0.0	0.0
Available-for-sale debt securities	$ 4.0	$ 7.6