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Note 10 - Contingencies (Details Textual) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 41 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 15, 2022 USD ($) | Aug. 28, 2022 USD ($) | Nov. 27, 2022 USD ($) | May 30, 2021 USD ($) | May 31, 2020 USD ($) | Nov. 27, 2022 USD ($)
Threshold Amount For Environmental Matters |  |  | $ 1.0 |  |  |
Lamb Weston Holdings Inc [Member] |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term (Year) |  |  | 5 years |  |  | 5 years
Briseno v. ConAgra Foods, Inc [Member] |  |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party | $ 3.0 |  |  |  |  |
Beatrice [Member] |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Ending Balance |  |  | $ 39.2 |  |  | $ 39.2
Beatrice [Member] | Other Accrued Liabilities [Member] |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Ending Balance |  |  | 2.0 |  |  | 2.0
Beatrice [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Ending Balance |  |  | 37.2 |  |  | 37.2
MPCA [Member] |  |  |  |  |  |
Accrued Environmental Loss Contingencies, Proposed Penalty Amount |  |  |  | $ 4.3 | $ 1.8 |
Performance And Payment Guarantee [Member] |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  | 75.0 |  |  | 75.0
Property Lease Guarantee [Member] |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  | $ 10.0 |  |  | 10.0
Lease Remaining Lease Terms (Year) |  |  | 4 years |  |  |
ILLINOIS |  |  |  |  |  |
Loss Contingency Number Of Suits |  | 1 |  |  |  |
CALIFORNIA | Beatrice [Member] |  |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party |  | $ 101.7 |  |  |  |
Loss Contingency Settlement Agreement Terms Number Of Installments |  | 7 |  |  |  |
Loss Contingency Accrual, Payments |  |  |  |  |  | 61.0
CALIFORNIA | Beatrice [Member] | Other Accrued Liabilities [Member] |  |  |  |  |  |
Loss Contingency Accrual, Ending Balance |  |  | $ 11.4 |  |  | 11.4
CALIFORNIA | Beatrice [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |  |
Loss Contingency Accrual, Ending Balance |  |  | 29.1 |  |  | $ 29.1
CALIFORNIA | Beatrice [Member] | Maximum [Member] |  |  |  |  |  |
Litigation Settlement Amount Of Guarantee |  |  | $ 15.0 |  |  |

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