Note 17 - Pension and Postretirement Benefits - Other Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	May 29, 2022	May 30, 2021
Pension Plan [Member]
Net actuarial gain (loss)	$ (8.5)	$ 92.0
Amendments	(3.7)	0.0
Amortization of prior service cost (benefit)	1.9	2.3
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	0.0	0.2
Recognized net actuarial loss (gain)	(2.9)	0.8
Currency	0.1	(0.2)
Net amount recognized	(13.1)	95.1
Other Postretirement Benefits Plan [Member]
Net actuarial gain (loss)	9.6	2.5
Amendments	0.0	0.0
Amortization of prior service cost (benefit)	(2.0)	(2.1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	0.0	(0.5)
Recognized net actuarial loss (gain)	(3.5)	(3.5)
Currency	0.1	(0.2)
Net amount recognized	$ 4.2	$ (3.8)