Note 12 - Pension and Postretirement Benefits (Details Textual) $ in Millions	3 Months Ended
	Aug. 27, 2023 USD ($)
Pension Plan [Member]
Defined Benefit Plan, Service Cost Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate	5.64%
Defined Benefit Plan, Interest Cost Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate	5.44%
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 3.1
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	9.0
Postemployment Retirement Benefits [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	1.6
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 5.6