Note 17 - Pension and Postretirement Benefits - Schedule of Changes in Benefit Obligations and Plan Asset (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2023	May 29, 2022	May 30, 2021
Fair value of plan assets at beginning of year	$ 3,294.7
Fair value of plan assets at end of year		$ 3,294.7
Pension Plan [Member]
Benefit obligation at beginning of year	3,132.6	3,739.2
Service cost	6.5	8.7	$ 11.6
Interest cost	124.0	83.3	86.8
Amendments	3.0	3.7
Actuarial gain	(265.5)	(503.1)
Benefits paid	(199.3)	(198.3)
Currency	(1.1)	(0.9)
Benefit obligation at end of year	2,800.2	3,132.6	3,739.2
Fair value of plan assets at beginning of year	3,294.7	3,848.8
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(158.1)	(366.1)
Employer contributions	12.5	11.5
Benefits paid	(199.3)	(198.4)
Currency	(1.3)	(1.1)
Fair value of plan assets at end of year	2,948.5	3,294.7	3,848.8
Other Postretirement Benefits Plan [Member]
Benefit obligation at beginning of year	64.8	81.5
Service cost	0.1	0.2	0.2
Interest cost	2.3	1.3	1.5
Amendments	0.0	0.0
Actuarial gain	(6.3)	(9.5)
Benefits paid	(7.3)	(8.2)
Currency	(0.4)	(0.5)
Benefit obligation at end of year	53.2	64.8	81.5
Fair value of plan assets at beginning of year	3.4	3.3
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	0.1	0.1
Employer contributions	7.3	8.2
Benefits paid	(7.3)	(8.2)
Currency	0.0	0.0
Fair value of plan assets at end of year	$ 3.5	$ 3.4	$ 3.3