Note 17 - Pension and Postretirement Benefits - Weighted Average Actuarial Assumption Used to Determine Net Expense (Details)	12 Months Ended
	May 28, 2023	May 29, 2022	May 30, 2021
Pension Plan [Member]
Long-term rate of return on plan assets	4.56%	3.87%	3.74%
Interest Cost [Member] | Pension Plan [Member]
Discount rate - interest cost	4.09%	2.29%	2.30%
Interest Cost [Member] | Other Postretirement Benefits Plan [Member]
Discount rate - interest cost	3.83%	1.69%	1.74%
Service Cost [Member] | Pension Plan [Member]
Discount rate - interest cost	4.74%	3.50%	3.35%
Service Cost [Member] | Other Postretirement Benefits Plan [Member]
Discount rate - interest cost	4.60%	3.55%	3.03%