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Note 11 - Contingencies (Details Textual)
$ in Millions
3 Months Ended 12 Months Ended 38 Months Ended
Aug. 28, 2022
USD ($)
May 30, 2021
USD ($)
May 31, 2020
USD ($)
Aug. 28, 2022
USD ($)
Sep. 04, 2018
USD ($)
Jan. 27, 2014
USD ($)
Threshold Amount For Environmental Matters $ 1.0          
Lamb Weston Holdings Inc [Member]            
Lessee, Operating Lease, Renewal Term (Year) 5 years     5 years    
Beatrice [Member]            
Accrual for Environmental Loss Contingencies, Ending Balance $ 39.6     $ 39.6    
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 37.6     37.6    
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 $ 10.6     $ 10.6    
Lease Remaining Lease Terms (Year) 5 years          
ILLINOIS            
Loss Contingency Number Of Suits 1          
CALIFORNIA | Beatrice [Member]            
Loss Contingency, Estimate of Possible Loss         $ 409.0 $ 1,150.0
Litigation Settlement, Amount Awarded to Other Party $ 101.7          
Loss Contingency Settlement Agreement Terms Number Of Installments 7     7    
Loss Contingency Accrual, Payments       $ 49.0    
CALIFORNIA | Beatrice [Member] | Other Accrued Liabilities [Member]            
Loss Contingency Accrual, Ending Balance $ 11.9     11.9    
CALIFORNIA | Beatrice [Member] | Other Noncurrent Liabilities [Member]            
Loss Contingency Accrual, Ending Balance 40.4     $ 40.4    
CALIFORNIA | Beatrice [Member] | Maximum [Member]            
Litigation Settlement Amount Of Guarantee $ 15.0