Note 17 - Pension and Postretirement Benefits - Other Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2023	May 29, 2022
Pension Plan [Member]
Net actuarial gain (loss)	$ (38.4)	$ (8.5)
Amendments	(3.0)	(3.7)
Amortization of prior service cost (benefit)	1.4	1.9
Recognized net actuarial gain	0.0	(2.9)
Currency	0.1	0.1
Net amount recognized	(39.9)	(13.1)
Other Postretirement Benefits Plan [Member]
Net actuarial gain (loss)	6.3	9.6
Amendments	0.0	0.0
Amortization of prior service cost (benefit)	(1.7)	(2.0)
Recognized net actuarial gain	(4.4)	(3.5)
Currency	0.0	0.1
Net amount recognized	$ 0.2	$ 4.2