Note 15 - Contingencies (Details Textual) $ in Thousands		12 Months Ended
	May 28, 2023 USD ($)	May 28, 2023 USD ($)	May 29, 2022 USD ($)	May 30, 2021 USD ($)
Threshold Amount For Environmental Matters			$ 1,000
Accrued Environmental Loss Contingencies, Proposed Penalty Amount	$ 1,250
Lamb Weston Holdings Inc [Member]
Lessee, Operating Lease, Renewal Term (Year)	5 years	5 years
Negrete v. ConAgra Foods, In [Member]
Litigation Settlement, Amount Awarded to Other Party		$ 3,000
Loss Contingency, Claims Settled, Number		1
Beatrice [Member]
Accrual for Environmental Loss Contingencies	$ 40,100	$ 40,100
Beatrice [Member] | Other Accrued Liabilities [Member]
Accrual for Environmental Loss Contingencies	1,500	1,500
Beatrice [Member] | Other Noncurrent Liabilities [Member]
Accrual for Environmental Loss Contingencies	38,600	38,600
Performance And Payment Guarantee [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	75,000	75,000
Property Lease Guarantee [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	8,700	$ 8,700
Lease Remaining Lease Terms (Year)		4 years
CANADA | Beatrice [Member]
Litigation Settlement, Amount Awarded to Other Party				$ 101,700
Loss Contingency Settlement Agreement Terms Number Of Installments				7
Loss Contingency Accrual, Payments		$ 61,000
CANADA | Beatrice [Member] | Other Accrued Liabilities [Member]
Loss Contingency Accrual	11,800	11,800
CANADA | Beatrice [Member] | Other Noncurrent Liabilities [Member]
Loss Contingency Accrual	$ 28,900	28,900
CANADA | Beatrice [Member] | Maximum [Member]
Litigation Settlement Amount Of Guarantee		$ 15,000