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Note 4 - Goodwill and Other Identifiable Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 26, 2023
Aug. 28, 2022
Feb. 27, 2022
Feb. 26, 2023
Feb. 26, 2023
Feb. 27, 2022
Fair Value Measurement, Inputs, Terminal Growth Rate         1.00%  
Goodwill, Impairment Loss         $ 141.7  
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)         18 years  
Amortization of Intangible Assets $ 13.8   $ 14.8 $ 43.3   $ 44.5
Finite-Lived Intangible Asset, Expected Amortization, Year One 47.6     47.6 $ 47.6  
Finite-Lived Intangible Asset, Expected Amortization, Year Two 47.6     47.6 47.6  
Finite-Lived Intangible Asset, Expected Amortization, Year Three 47.6     47.6 47.6  
Finite-Lived Intangible Asset, Expected Amortization, Year Four 47.6     47.6 47.6  
Finite-Lived Intangible Asset, Expected Amortization, Year Five $ 47.6     $ 47.6 47.6  
Refrigerated And Frozen [Member]            
Goodwill, Impairment Loss         $ 141.7  
Selling, General and Administrative Expenses [Member] | Refrigerated And Frozen [Member]            
Goodwill, Impairment Loss   $ 141.7        
Selling, General and Administrative Expenses [Member] | Refrigerated And Frozen [Member] | Trade Names [Member]            
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)   $ 244.0        
Sides Components And Enhancers Reporting Unit [Member]            
Fair Value Measurement, Inputs, Discount Rate         7.75%