Note 11 - 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		6 Months Ended
	Nov. 27, 2022	Nov. 28, 2021	Nov. 27, 2022	Nov. 28, 2021
Pension Plan [Member]
Service cost	$ 1.7	$ 2.0	$ 3.3	$ 4.7
Interest cost	31.0	20.8	62.0	41.6
Expected return on plan assets	(36.4)	(36.3)	(72.9)	(72.7)
Amortization of prior service cost	0.3	0.4	0.7	0.9
Total pension and postretirement cost (benefit)	(0.6)	(10.7)	(1.9)	(21.2)
Pension Plan [Member] | Company Plans [Member]
Total pension and postretirement cost (benefit)	(3.4)	(13.1)	(6.9)	(25.5)
Pension Plan [Member] | Multi Employer Plans [Member]
Total pension and postretirement cost (benefit)	2.8	2.4	5.0	4.3
Other Postretirement Benefits Plan [Member]
Service cost	0.1	0.1	0.1	0.1
Interest cost	0.6	0.4	1.1	0.7
Amortization of prior service cost	(0.5)	(0.4)	(0.9)	(0.9)
Total pension and postretirement cost (benefit)	(0.9)	(0.9)	(1.9)	(1.9)
Recognized net actuarial gain	$ (1.1)	$ (1.0)	$ (2.2)	$ (1.8)