Note 12 - Pension and Postretirement Benefits (Details Textual) $ in Millions	3 Months Ended
	Aug. 30, 2022 USD ($)
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	$ 3.0
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	9.4
Postemployment Retirement Benefits [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	1.9
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 6.2