Note 17 - Pension and Postretirement Benefits - Schedule of Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2023	May 29, 2022	May 30, 2021
Projected benefit obligation	$ 101.6	$ 114.9
Accumulated benefit obligation	101.6	114.9
Pension Plan [Member]
Service cost	6.5	8.7	$ 11.6
Interest cost	124.0	83.3	86.8
Expected return on plan assets	(145.9)	(145.4)	(140.0)
Amortization of prior service cost (benefit)	1.4	1.9	2.3
Recognized net actuarial loss (gain)	0.1	(2.9)	0.8
Settlement gain	0.0	0.0	0.0
Curtailment loss	0.0	0.0	0.2
Total pension and postretirement cost (benefit)	(4.7)	(46.3)	(30.9)
Total pension and postretirement cost (benefit)	(4.7)	(46.3)	(30.9)
Pension Plan [Member] | Company Plans [Member]
Total pension and postretirement cost (benefit)	(13.9)	(54.4)	(38.3)
Total pension and postretirement cost (benefit)	(13.9)	(54.4)	(38.3)
Pension Plan [Member] | Multi Employer Plans [Member]
Total pension and postretirement cost (benefit)	9.2	8.1	7.4
Total pension and postretirement cost (benefit)	9.2	8.1	7.4
Other Postretirement Benefits Plan [Member]
Service cost	0.1	0.2	0.2
Interest cost	2.3	1.3	1.5
Expected return on plan assets	0.0	0.0	0.0
Amortization of prior service cost (benefit)	(1.7)	(2.0)	(2.1)
Recognized net actuarial loss (gain)	(4.4)	(3.5)	(3.5)
Settlement gain	0.0	0.0	(0.5)
Curtailment loss	0.0	0.0	0.0
Total pension and postretirement cost (benefit)	(3.7)	(4.0)	(4.4)
Total pension and postretirement cost (benefit)	(3.7)	(4.0)	(4.4)
Other Postretirement Benefits Plan [Member] | Company Plans [Member]
Total pension and postretirement cost (benefit)	(3.7)	(4.0)	(4.4)
Total pension and postretirement cost (benefit)	(3.7)	(4.0)	(4.4)
Other Postretirement Benefits Plan [Member] | Multi Employer Plans [Member]
Total pension and postretirement cost (benefit)	0.0	0.0	0.0
Total pension and postretirement cost (benefit)	$ 0.0	$ 0.0	$ 0.0