Note 11 - Pension and Postretirement Benefits (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 27, 2022	Nov. 28, 2021	Nov. 27, 2022	Nov. 28, 2021
Pension Plan [Member]
Defined Benefit Plan, Service Cost Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate			4.74%
Defined Benefit Plan, Interest Cost Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate			4.09%
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 2.9	$ 1.7	$ 5.9	$ 3.6
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	6.5		6.5
Postemployment Retirement Benefits [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 4.5		$ 4.5