Note 12 - Pension and Postretirement Benefits - Schedule of Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 27, 2023	Aug. 28, 2022
Pension Plan [Member]
Service cost	$ 1.5	$ 1.6
Interest cost	36.7	31.0
Expected return on plan assets	(35.8)	(36.5)
Amortization of prior service cost	0.4	0.4
Total pension and postretirement cost (benefit)	4.9	(1.3)
Total pension and postretirement cost (benefit)	4.9	(1.3)
Total pension and postretirement cost (benefit)	4.9	(1.3)
Pension Plan [Member] | Company Plans [Member]
Total pension and postretirement cost (benefit)	2.8	(3.5)
Total pension and postretirement cost (benefit)	2.8	(3.5)
Total pension and postretirement cost (benefit)	2.8	(3.5)
Pension Plan [Member] | Multi Employer Plans [Member]
Total pension and postretirement cost (benefit)	2.1	2.2
Total pension and postretirement cost (benefit)	2.1	2.2
Total pension and postretirement cost (benefit)	2.1	2.2
Other Postretirement Benefits Plan [Member]
Interest cost	0.6	0.5
Amortization of prior service cost	(0.4)	(0.4)
Total pension and postretirement cost (benefit)	(1.0)	(1.0)
Total pension and postretirement cost (benefit)	(1.0)	(1.0)
Total pension and postretirement cost (benefit)	(1.0)	(1.0)
Recognized net actuarial gain	$ (1.2)	$ (1.1)