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Note 7 - Goodwill and Other Identifiable Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Aug. 30, 2020
Aug. 25, 2019
May 29, 2022
May 30, 2021
May 31, 2020
Fair Value Measurements, Discounted Cash Flow, Period (Year) 5 years        
Fair Value Measurement, Inputs, Terminal Growth Rate 1.00%        
Amortization of Intangible Assets     $ 59.3 $ 59.7 $ 59.8
Sides Components And Enhancers Reporting Unit [Member]          
Fair Value Measurement, Inputs, Discount Rate 6.50%        
Refrigerated And Frozen [Member]          
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)     103.9 76.9 110.8
Refrigerated And Frozen [Member] | Sides Components And Enhancers Reporting Unit [Member]          
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 20.00%        
Grocery Snacks and Refrigerated Frozen [Member] | Trademarks and Trade Names [Member]          
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)   $ 19.3 $ 209.0 $ 90.9 $ 146.2