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Note 7 - Goodwill and Other Identifiable Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 28, 2023
Aug. 28, 2022
May 28, 2023
May 29, 2022
May 30, 2021
Fair Value Measurement, Inputs, Terminal Growth Rate   1.00% 1.00%    
Goodwill, Impairment Loss     $ 141.7    
Amortization of Intangible Assets     56.8 $ 59.3 $ 59.7
Trade Names [Member]          
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)     589.2    
Refrigerated And Frozen [Member]          
Goodwill, Impairment Loss     141.7    
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)     496.6 103.9 76.9
Grocery Snacks and Refrigerated Frozen [Member] | Trademarks and Trade Names [Member]          
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill) $ 345.2     $ 209.0 $ 90.9
Grocery Snacks and Refrigerated Frozen [Member] | Gardein Brand Name [Member]          
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)     91.5    
Grocery Snacks and Refrigerated Frozen [Member] | Birds Eye Brand Name [Member]          
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)     78.3    
Selling, General and Administrative Expenses [Member] | Refrigerated And Frozen [Member]          
Goodwill, Impairment Loss   $ 141.7 $ 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% 7.75%